01 - Line a large baking sheet with parchment paper or silicone baking mat.
02 - In a large mixing bowl, combine Rice Chex, mini pretzels, and popcorn.
03 - Pour melted white chocolate over the mixture and gently toss until evenly coated.
04 - Add mini marshmallows, green chocolate candies, and white chocolate chips. Toss gently to distribute evenly.
05 - Spread mixture in an even layer on prepared baking sheet. Immediately sprinkle rainbow sprinkles over top before chocolate sets.
06 - Allow mix to sit at room temperature for 20 to 30 minutes until chocolate hardens. Break into clusters and serve, or store in airtight container for up to 5 days.