Step 1: Preheat the oven to 350°F (175°C) to ensure even baking.
Step 2: Grease a 9x13 inch baking pan lightly with non-stick spray or line it with parchment paper.
Step 3: In a large mixing bowl, combine the melted butter, Oreo crumbs, and half of the sweetened condensed milk (about 7 ounces). Mix until coated.
Step 4: Press the crumb mixture firmly into an even layer at the bottom of the pan.
Step 5: Sprinkle the coconut, chocolate chips, Peppermint M&M's, and Andes Peppermint Crunch over the crust. Drizzle remaining sweetened condensed milk on top.
Step 6: Crush the additional 10 Oreos and sprinkle them over the top of the layered ingredients.
Step 7: Bake for 25-30 minutes, or until the edges are golden and the center is set.
Step 8: Let cool completely on a wire rack, then cut into squares and serve.
