Top cupcakes with marshmallows as directed. Stir 5 drops yellow food coloring into 1/2 cup water; brush lightly onto marshmallows to resemble buttered popcorn.
How to Make Caramel Popcorn
Top cupcakes with marshmallows as directed. Microwave 16 KRAFT Caramels and 2 Tbsp. water in microwaveable bowl on HIGH 1 min.; stir until smooth. Drizzle lightly over marshmallow-topped cupcakes to resemble caramel corn.
Before filling paper baking cups with cake batter, color them with red and white stripes to resemble popcorn bags. Tape a small "popcorn" label to each cupcake liner before serving.