Combine cereal, pretzels, peanuts, and M&M's in a large bowl
Line 2 large baking sheets with wax or parchment paper (or you could spread a couple of large pieces on your countertop if they can tolerate a bit of heat)
Place Almond Bark in a large glass bowl
Microwave in 30 second intervals until the Almond Bark is melted and very pourable
Pour melted Almond Bark over dry ingredients; stirring gently to combine
Once combined, spoon mixture onto the wax paper and spread
Add sprinkles, if desired
Cool on countertop or pop into the refrigerator until set
Break into pieces and store in an air-tight container at room temperature
