Toss together the 2 1/2 cups Chex cereal, 1 cup pretzels and 1 cup Cheerios cereal until blended. Set aside.
In a medium saucepan, melt the 4 tablespoons salted butter over low heat. Stir in the 12 ounces 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 to the dry mix, toss, and repeat until the whole mixture is covered. White chocolate tends to be clumpy instead of smooth, this is normal.
Turn it out onto a parchment lined rimmed baking sheet into a single layer and sprinkle with the 3/4 cup holiday M&Ms, 1/2 cup jelly beans and festive sprinkles, if using, while chocolate is still tacky. Melt the 1/4 cup pink or purple melting chocolate, if using, and drizzle over the mixture.
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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