Line a large baking sheet or tray with parchment paper and set aside.
In a large mixing bowl, combine the Rice Chex, pretzels, peanuts, and M&Ms. Toss gently to distribute evenly.
Melt the almond bark according to package directions, typically in a microwave-safe bowl in 30-second intervals, stirring between each, until completely smooth.
Pour the melted almond bark over the mix and stir gently until everything is evenly coated.
Spread into an even layer on the prepared baking sheet.
Let sit at room temperature for 30 minutes until the almond bark hardens completely. For faster setting, refrigerate for 15 minutes.
Break into clusters and serve.