Top cupcakes with marshmallows as directed. Stir 5 drops yellow food colouring 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 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.