Toss together the Chex, pretzels, Cheerios, peanuts and M&Ms until blended. Set aside.
In a medium saucepan, melt the butter over low heat. Stir in the almond bark or white chocolate chips until smooth. Heat this very low... white chocolate has more of a tendency to clump if overheated.
Working in 3 increments, add some melted chocolate, toss, and repeat until the whole mixture is covered.
Turn it out onto a parchment lined rimmed baking sheet into a single layer and sprinkle with festive sprinkles, if using, while chocolate is still tacky.
Allow the chocolate to set and then break into pieces and store in an airtight container or bag at room temperature until ready to enjoy.
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