Before starting line a sheet pan with wax paper. Set out cookie cutters.

In a large nonstick pan over medium-high heat, combine butter and cocoa powder. Stir until melted.

Add marshmallows and keep stirring until melted, 4 to 6 minutes.

Remove pan from heat and stir in cereal and chocolate chips until fully combined.

Spray hands and cookie cutters with nonstick cooking spray.

Working quickly (the mixture will be harder to work with as it sets), press marshmallow-cereal mixture into the top of each cookie cutter. Be sure to press the mixture into the corners of each cutter. Lift the cookie cutters away. Repeat with all of the remaining mixture.

Allow treats to cool until fully set, ~30 minutes.

Store in an airtight container at room temperature for up to 3 days.

Decorate with icing, sprinkles and candy as you'd like!