Introduction
Craving a decadent dessert that combines the gooey goodness of s’mores with the crunch of Oreos? What if you could create a show-stopping brownie layered with graham crackers, marshmallows, and cookies in under an hour? Say hello to S’more Brownies with Oreos! This indulgent treat features a fudgy brownie base, a graham cracker crust, Mini Oreos, and toasted marshmallows, delivering a campfire-inspired dessert with a chocolatey twist. Perfect for parties, movie nights, or satisfying sweet cravings, this beginner-friendly recipe is a guaranteed hit. Ready to create some gooey, crunchy magic? Let’s grab a baking dish and get started!
Overview
S’more Brownies with Oreos are baked desserts made by layering graham crackers, brownie batter, Mini Oreos, and flat s’more marshmallows, topped with more brownie batter and toasted marshmallows under the broiler. What makes them special? The combination of fudgy brownies, crunchy graham crackers, creamy Oreos, and gooey marshmallows creates a delightful mix of textures and flavors reminiscent of classic s’mores with an Oreo upgrade. This easy recipe takes about 3 hours (15 minutes prep, 45 minutes baking, 2 hours cooling) and serves 12–16, making it ideal for sharing at gatherings.
- Time Requirement: 3 hours (15 minutes prep, 45 minutes baking, 2 hours cooling)
- Difficulty Level: Easy (great for beginners)
- Servings: 12–16 brownies
Essential Ingredients
The magic of S’more Brownies with Oreos lies in their nostalgic, indulgent ingredients. Here’s what you’ll need and why each one matters:
For the Brownies
- Brownie Mix (1 box, typically 18–20 oz): Provides a quick, fudgy base for the brownies; choose your favorite brand.
- Ingredients for Brownie Mix (as per box instructions, typically eggs, oil, and water): Bind and moisten the brownie batter.
- Graham Crackers (7–9 full sheets): Form a crunchy s’mores-inspired base.
- Mini Oreos (8 oz, about 1 Snak-Sack): Add creamy, chocolatey crunch; full-sized Oreos can be used but require more space.
- Flat S’more Marshmallows (20, such as Jet-Puffed S’moreMallows): Provide gooey texture and toast beautifully for s’mores flavor.
Substitutions and Variations
- Brownie Mix: Use a fudge, dark chocolate, or gluten-free brownie mix; for homemade, combine 1 cup sugar, ½ cup flour, ⅓ cup cocoa, 2 eggs, ½ cup melted butter, and 1 tsp vanilla.
- Graham Crackers: Substitute with digestive biscuits, shortbread cookies, or gluten-free graham crackers.
- Mini Oreos: Use full-sized Oreos (about 12–15), Golden Oreos, or chocolate sandwich cookies; crush for easier layering if desired.
- S’more Marshmallows: Replace with regular marshmallows (cut into thin pieces) or mini marshmallows (use 1½ cups for the inner layer, ½ cup for topping).
- Vegan Option: Use a vegan brownie mix, vegan eggs (e.g., flax eggs: 1 tbsp flaxseed + 3 tbsp water per egg), vegan Oreos (standard Oreos are vegan), and vegan marshmallows.
- Gluten-Free: Use a gluten-free brownie mix, gluten-free graham crackers, and ensure Oreos and marshmallows are gluten-free (use gluten-free sandwich cookies if needed).

Step-by-Step Instructions
Making S’more Brownies with Oreos is straightforward with a simple layering and baking process. Follow these instructions for perfect brownies every time:
- Prepare the Baking Dish:
- Preheat the oven to 325°F (165°C).
- Line a 9×13-inch glass baking dish with parchment paper, leaving an overhang on two sides for easy removal. Lightly spray with non-stick spray to secure the paper.
- Tip: Use a glass dish for even baking, and ensure parchment covers the sides to prevent sticking.
- Prepare the Brownie Batter:
- Prepare 1 box brownie mix according to package instructions (typically mixing with eggs, oil, and water) in a large mixing bowl, stirring until smooth, about 1–2 minutes.
- Tip: Follow the box’s “fudgy” instructions for a denser texture, and mix until just combined to avoid tough brownies.
- Layer the Graham Crackers:
- Lay 7–9 full graham cracker sheets in a single layer across the bottom of the prepared baking dish, breaking pieces to fit and cover as much surface as possible.
- Tip: Arrange crackers tightly to form a solid base, and trim edges with a knife for a neat fit.
- Add the First Brownie Layer:
- Using a spatula, spread about half of the brownie batter over the graham crackers, covering them as evenly as possible, about 1–2 minutes.
- Tip: Spread gently to avoid shifting the crackers, and use an offset spatula for a smooth layer; reserve the remaining batter.
- Layer the Mini Oreos:
- Place 8 oz Mini Oreos in a single layer over the brownie batter, arranging them closely to cover the surface, about 1 minute.
- Tip: Press Oreos lightly to adhere to the batter, and use full-sized Oreos if preferred, spacing them evenly (about 12–15 cookies).
- Add the Marshmallow Layer:
- Cut 20 flat s’more marshmallows (such as Jet-Puffed S’moreMallows) in half to create thinner pieces, yielding 40 halves.
- Layer the marshmallow halves evenly over the Oreos, covering the cookies as much as possible, about 1–2 minutes.
- Tip: Cut marshmallows with a greased knife to prevent sticking, and overlap slightly for a uniform layer.
- Cover with Remaining Batter:
- Spread the remaining brownie batter over the marshmallows and around the sides of the Oreos, using a spatula to smooth it evenly, about 1–2 minutes.
- Tip: Work gently to cover the marshmallows completely, and spread to the edges for a polished look; tap the dish to level the batter.
- Bake:
- Bake in the preheated oven for 45 minutes, or until the top is set and a toothpick inserted in the center comes out with a few moist crumbs.
- Check for doneness around 35 minutes, as ovens vary; the brownies should be slightly firm but fudgy.
- Tip: Slightly overbake (45–48 minutes) for easier slicing, and cover with foil if the top browns too quickly.
- Add the Topping:
- Remove the brownies from the oven and immediately top with the remaining marshmallow halves (from the 20 cut marshmallows, about 10–12 halves).
- Place the dish under the broiler on high for 1–2 minutes, until the marshmallows are golden brown, watching closely to prevent burning.
- Tip: Stay by the oven during broiling, as marshmallows burn quickly; rotate the dish if needed for even toasting.
- Cool and Slice:
- Let the brownies cool completely in the dish on a wire rack, about 2 hours, to set and avoid a gooey mess when slicing.
- Use the parchment overhang to lift the brownies out and transfer to a cutting board.
- Slice into 12–16 squares (3×4 or 4×4 grid) using a sharp knife, wiping the blade between cuts for clean edges.
- Serve at room temperature, optionally with ice cream or hot cocoa.
- Tip: Run the knife under hot water for smoother cuts, and refrigerate for 30 minutes before slicing if still too gooey.

Assembly
Assembling S’more Brownies with Oreos is all about creating a layered, gooey dessert with s’mores and Oreo flair for a treat that’s as indulgent as it is nostalgic. Here’s how to make them look and taste incredible:
- Layer Thoughtfully: Arrange graham crackers tightly, spread batter evenly, and layer Oreos and marshmallows uniformly for balanced flavors and textures.
- Preparation Tips:
- Use a 9×13-inch glass dish for the ideal thickness; an 8×8-inch dish makes thicker brownies (bake 50–55 minutes), while an 11×7-inch dish makes thinner ones (bake 40–45 minutes).
- Cut marshmallows in half for a thinner layer that bakes evenly, and grease tools to prevent sticking.
- Spread brownie batter carefully to cover each layer, ensuring marshmallows are fully encased to avoid burning during baking.
- Presentation Tips:
- Serve in the dish or on a festive platter to highlight the toasted marshmallow topping and fudgy layers.
- Garnish with extra crushed Oreos, graham cracker crumbs, or a drizzle of chocolate syrup for a decadent touch.
- Pair with coffee, milk, or a campfire-inspired hot chocolate for a complete dessert experience, perfect for movie nights, potlucks, or summer parties.
- Slice neatly and stack in a pyramid or fan out on a tray to showcase the layered graham crackers, Oreos, and marshmallows, offering napkins for this sticky treat.
Storage and Make-Ahead Tips
S’more Brownies with Oreos are best fresh but can be prepped or stored with these tips to maintain their quality:
- Make-Ahead:
- Prepare the brownie batter up to 4 hours in advance, cover, and refrigerate; stir before layering.
- Assemble the brownies (without the final marshmallow topping) up to 4 hours ahead, cover, and refrigerate; bake and broil fresh.
- Tip: Don’t add the final marshmallows too early, as they may soften; apply just before broiling.
- Storage:
- Store at room temperature, covered with plastic wrap or in an airtight container, for up to 2 days; refrigerate for up to 4 days to maintain freshness.
- Layer with parchment paper to prevent sticking, and reheat slices in a 300°F (150°C) oven for 5–7 minutes or microwave for 10–15 seconds to restore gooeyness.
- Tip: Store away from humid environments to preserve the marshmallow texture, and keep refrigerated if storing longer than 2 days due to marshmallows.
- Freezing:
- Freeze baked brownies (without the final marshmallow topping) for up to 1 month, wrapped individually in plastic wrap and stored in a freezer-safe bag. Thaw at room temperature for 1–2 hours, then add fresh marshmallows and broil.
- Freezing with toasted marshmallows is not recommended, as they lose texture when thawed.
- Tip: Label with the date to track freshness, and freeze in a single layer to avoid crushing; add toppings fresh after thawing.
Recipe Variations
S’more Brownies with Oreos are versatile and fun to customize. Here are some creative twists to try:
- Peanut Butter S’more Brownies: Use peanut butter Oreos or swirl ¼ cup melted peanut butter into the brownie batter.
- Salted Caramel S’more Brownies: Drizzle caramel sauce over the Oreo layer and sprinkle with flaky sea salt.
- Mint S’more Brownies: Use mint Oreos and add ½ tsp peppermint extract to the brownie batter.
- White Chocolate S’more Brownies: Replace Oreos with white chocolate chips and use white chocolate marshmallows if available.
- Gluten-Free S’more Brownies: Use a gluten-free brownie mix, gluten-free graham crackers, and gluten-free sandwich cookies.
- Vegan S’more Brownies: Use a vegan brownie mix, flax eggs, vegan Oreos, and vegan marshmallows.
Safety and Tips
Baking and broiling brownies requires minimal effort but some care for a safe and successful result:
- Handle Hot Equipment Safely: Use oven mitts when handling the hot baking dish, and let brownies cool before lifting to avoid burns.
- Broil Safely: Watch the brownies constantly under the broiler to prevent burning marshmallows, and use oven mitts when removing the dish.
- Prevent Sticking: Line the dish with parchment and spray lightly to ensure easy removal, and lift carefully to avoid breaking the brownies.
- Clean Up Spills: Wipe batter, marshmallow, or Oreo spills immediately with a damp cloth, and soak tools in hot water for easy cleaning.
Nutritional Information
Per brownie (based on 16 servings):
- Calories: ~350 kcal
- Protein: ~4 g
- Fat: ~16 g
- Carbohydrates: ~50 g
- Sugar: ~35 g
- Fiber: ~1 g Note: Values are approximate and vary based on brownie mix brand, portion size, and specific ingredients. Reducing marshmallows or Oreos may lower calories and sugar.
Conclusion
You’re now ready to create S’more Brownies with Oreos that are as gooey as they are irresistible! This 3-hour recipe is perfect for parties, movie nights, or anytime you crave a s’mores-inspired treat with an Oreo twist. With their fudgy brownie base, crunchy graham crackers, creamy Oreos, and toasted marshmallows, these brownies are a guaranteed crowd-pleaser. Feel free to tweak the cookies, toppings, or flavors to make them your own. Grab your baking dish, layer those marshmallows, and enjoy every sticky, chocolatey bite. Happy baking, and savor the s’more brownie bliss!
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S’more Brownies with Oreos
Description
Craving a decadent dessert that combines the gooey goodness of s’mores with the crunch of Oreos? What if you could create a show-stopping brownie layered with graham crackers, marshmallows, and cookies in under an hour? Say hello to S’more Brownies with Oreos! This indulgent treat features a fudgy brownie base, a graham cracker crust, Mini Oreos, and toasted marshmallows, delivering a campfire-inspired dessert with a chocolatey twist.
Ingredients
For the Brownies
-
Brownie Mix (1 box, typically 18–20 oz): Provides a quick, fudgy base for the brownies; choose your favorite brand.
-
Ingredients for Brownie Mix (as per box instructions, typically eggs, oil, and water): Bind and moisten the brownie batter.
-
Graham Crackers (7–9 full sheets): Form a crunchy s’mores-inspired base.
-
Mini Oreos (8 oz, about 1 Snak-Sack): Add creamy, chocolatey crunch; full-sized Oreos can be used but require more space.
-
Flat S’more Marshmallows (20, such as Jet-Puffed S’moreMallows): Provide gooey texture and toast beautifully for s’mores flavor.
Substitutions and Variations
-
Brownie Mix: Use a fudge, dark chocolate, or gluten-free brownie mix; for homemade, combine 1 cup sugar, ½ cup flour, ⅓ cup cocoa, 2 eggs, ½ cup melted butter, and 1 tsp vanilla.
-
Graham Crackers: Substitute with digestive biscuits, shortbread cookies, or gluten-free graham crackers.
-
Mini Oreos: Use full-sized Oreos (about 12–15), Golden Oreos, or chocolate sandwich cookies; crush for easier layering if desired.
-
S’more Marshmallows: Replace with regular marshmallows (cut into thin pieces) or mini marshmallows (use 1½ cups for the inner layer, ½ cup for topping).
-
Vegan Option: Use a vegan brownie mix, vegan eggs (e.g., flax eggs: 1 tbsp flaxseed + 3 tbsp water per egg), vegan Oreos (standard Oreos are vegan), and vegan marshmallows.
-
Gluten-Free: Use a gluten-free brownie mix, gluten-free graham crackers, and ensure Oreos and marshmallows are gluten-free (use gluten-free sandwich cookies if needed).
Instructions
-
Prepare the Baking Dish:
-
Preheat the oven to 325°F (165°C).
-
Line a 9×13-inch glass baking dish with parchment paper, leaving an overhang on two sides for easy removal. Lightly spray with non-stick spray to secure the paper.
-
Tip: Use a glass dish for even baking, and ensure parchment covers the sides to prevent sticking.
-
-
Prepare the Brownie Batter:
-
Prepare 1 box brownie mix according to package instructions (typically mixing with eggs, oil, and water) in a large mixing bowl, stirring until smooth, about 1–2 minutes.
-
Tip: Follow the box’s “fudgy” instructions for a denser texture, and mix until just combined to avoid tough brownies.
-
-
Layer the Graham Crackers:
-
Lay 7–9 full graham cracker sheets in a single layer across the bottom of the prepared baking dish, breaking pieces to fit and cover as much surface as possible.
-
Tip: Arrange crackers tightly to form a solid base, and trim edges with a knife for a neat fit.
-
-
Add the First Brownie Layer:
-
Using a spatula, spread about half of the brownie batter over the graham crackers, covering them as evenly as possible, about 1–2 minutes.
-
Tip: Spread gently to avoid shifting the crackers, and use an offset spatula for a smooth layer; reserve the remaining batter.
-
-
Layer the Mini Oreos:
-
Place 8 oz Mini Oreos in a single layer over the brownie batter, arranging them closely to cover the surface, about 1 minute.
-
Tip: Press Oreos lightly to adhere to the batter, and use full-sized Oreos if preferred, spacing them evenly (about 12–15 cookies).
-
-
Add the Marshmallow Layer:
-
Cut 20 flat s’more marshmallows (such as Jet-Puffed S’moreMallows) in half to create thinner pieces, yielding 40 halves.
-
Layer the marshmallow halves evenly over the Oreos, covering the cookies as much as possible, about 1–2 minutes.
-
Tip: Cut marshmallows with a greased knife to prevent sticking, and overlap slightly for a uniform layer.
-
-
Cover with Remaining Batter:
-
Spread the remaining brownie batter over the marshmallows and around the sides of the Oreos, using a spatula to smooth it evenly, about 1–2 minutes.
-
Tip: Work gently to cover the marshmallows completely, and spread to the edges for a polished look; tap the dish to level the batter.
-
-
Bake:
-
Bake in the preheated oven for 45 minutes, or until the top is set and a toothpick inserted in the center comes out with a few moist crumbs.
-
Check for doneness around 35 minutes, as ovens vary; the brownies should be slightly firm but fudgy.
-
Tip: Slightly overbake (45–48 minutes) for easier slicing, and cover with foil if the top browns too quickly.
-
-
Add the Topping:
-
Remove the brownies from the oven and immediately top with the remaining marshmallow halves (from the 20 cut marshmallows, about 10–12 halves).
-
Place the dish under the broiler on high for 1–2 minutes, until the marshmallows are golden brown, watching closely to prevent burning.
-
Tip: Stay by the oven during broiling, as marshmallows burn quickly; rotate the dish if needed for even toasting.
-
-
Cool and Slice:
-
Let the brownies cool completely in the dish on a wire rack, about 2 hours, to set and avoid a gooey mess when slicing.
-
Use the parchment overhang to lift the brownies out and transfer to a cutting board.
-
Slice into 12–16 squares (3×4 or 4×4 grid) using a sharp knife, wiping the blade between cuts for clean edges.
-
Serve at room temperature, optionally with ice cream or hot cocoa.
-
Tip: Run the knife under hot water for smoother cuts, and refrigerate for 30 minutes before slicing if still too gooey.
-
FAQs
1. Can I use full-sized Oreos instead of Mini Oreos?
Yes! Use about 12–15 full-sized Oreos, arranging them in a single layer. Break them if needed to fit, or crush for easier spreading.
2. Are these brownies very sweet?
They’re sweet from the brownie mix, marshmallows, and Oreos but balanced by the graham crackers. Use a darker chocolate brownie mix or fewer marshmallows for less sweetness.
3. Can I make these vegan?
Yes! Use a vegan brownie mix, flax eggs (1 tbsp flaxseed + 3 tbsp water per egg), vegan Oreos (standard Oreos are vegan), and vegan marshmallows.
4. Why are my brownies gooey?
Underbaking or insufficient cooling can make them gooey. Bake until set (around 45 minutes), and cool for 2 hours to firm up before slicing.
5. Can I use a different baking dish size?
Yes! An 8×8-inch dish makes thicker brownies (bake 50–55 minutes); an 11×7-inch dish makes thinner ones (bake 40–45 minutes). Adjust layers accordingly.
6. How do I prevent marshmallows from burning under the broiler?
Watch constantly, broil for no more than 1–2 minutes, and rotate the dish if needed. Keep the rack in the middle to avoid direct heat.
7. Can I prep these for a party?
Yes! Assemble up to 4 hours ahead, refrigerate, and bake fresh. Or bake up to 1 day ahead, store at room temperature, and broil marshmallows just before serving.
8. What’s the best way to store leftovers?
Store covered at room temperature for up to 2 days or in the fridge for up to 4 days. Reheat briefly to restore gooeyness before serving.