Pour one color of melted marshmallow over 1/4 of the popped corn. Use a rubber spatula (or hands) to toss popcorn in marshmallow mixture. Repeat with remaining melted marshmallows and remaining corn. Try to keep colors separate for rainbow effect.
Pour one color of melted marshmallow over 1/4 of the popped corn. Use a rubber spatula (or hands) to toss popcorn in marshmallow mixture. Repeat with remaining melted marshmallows and remaining corn. Try to keep colors separate for rainbow effect.