In a large bowl combine Rice Chex, Lucky Charms, pretzels, popcorn and M&Ms. In a heat-safe bowl, melt the white chocolate in the microwave for 30 seconds on 50% power. Stir and repeat until the chips are completely melted.
Pour the melted white chocolate over the cereal mixture. Stir carefully to combine, as to not crush the Rice Chex. Stir until the mixture is completely coated with the white chocolate.
Pour mixture onto wax paper or parchment paper to dry and spread it out. Repeat with melting the green chocolate, then spoon over the mixture. Then add the sprinkles.
Allow to set until white chocolate has hardened and then break up into pieces.
Store in an air-tight container.