1. Prepare the Chicken:

• Cut the chicken breasts into 1-inch pieces.
• In a large bowl, combine buttermilk, salt, and pepper. Add the chicken pieces, ensuring they’re fully coated. Cover and refrigerate for 30 minutes to 2 hours to marinate.

2. Prepare the Breading Mix:

• In a shallow bowl, mix the flour, cornstarch, baking powder, and seasonings (garlic powder, onion powder, paprika, cayenne pepper, and salt).
• In another bowl, beat the eggs. Place the panko breadcrumbs in a third bowl.

3. Coat the Nuggets:

• Remove the chicken from the buttermilk marinade.
• Dredge each piece in the flour mixture, then dip it into the beaten eggs, and finally coat it in panko breadcrumbs.
• Press the breadcrumbs gently onto the chicken to ensure even coating.

4. Fry the Nuggets:

• Heat the oil in a deep pan or fryer to 350°F (175°C).
• Fry the breaded chicken nuggets in small batches for 2-3 minutes, or until golden brown and cooked through.
• Use a slotted spoon to remove the nuggets and drain them on a paper towel-lined plate.