01 - Line a large baking sheet with parchment paper or a silicone baking mat and set aside.
02 - In a large mixing bowl, combine Rice Chex cereal, mini pretzels, and popcorn. Mix gently to distribute evenly.
03 - Pour the melted white chocolate over the dry mixture. Using a spatula, gently toss until all ingredients are evenly coated with chocolate.
04 - Add mini marshmallows, green chocolate candies, and white chocolate chips to the bowl. Toss gently to distribute throughout the mixture without crushing the cereal.
05 - Spread the mixture in an even layer on the prepared baking sheet. Immediately sprinkle rainbow sprinkles over the top before the chocolate begins to set.
06 - Allow the mix to sit at room temperature for 20-30 minutes until the white chocolate hardens completely and the coating becomes crisp.
07 - Break into clusters of desired size and serve immediately, or transfer to an airtight container for storage up to 5 days.