Separate the Lucky Charms: Carefully separate the marshmallows from the cereal pieces in the box of Lucky Charms. You should have about 2 cups of marshmallows and 6 cups of cereal.

Combine the Base: In a large bowl, combine the 6 cups of Lucky Charms cereal (the cereal pieces, not the marshmallows), the Rice Chex cereal, and the pretzels.

Melt the Candy Coating: In a microwave-safe bowl, melt the vanilla candy coating or almond bark according to the package directions. This usually involves microwaving in 30-second intervals, stirring after each interval, until smooth and melted. Be careful not to overheat it.

Coat the Mix: Pour the melted candy coating over the cereal and pretzel mixture in the large bowl. Use a large spoon or spatula to toss everything together until it’s evenly coated.

Spread and Decorate: Spread the coated mixture out in an even layer on a sheet of parchment paper. Immediately sprinkle with rainbow jimmies, then the Trix Minis cereal, and finally the reserved Lucky Charms marshmallows.

Cool and Break Apart: Allow the mixture to cool completely at room temperature. This will allow the candy coating to set and harden. Once it’s set, break it apart into pieces.

Store: Store in a clear glass jar or plastic bag at room temperature for up to 2 weeks