Seal the ziplock bag shut, place it on the counter, and using a rolling pin crush the Oreos until they become large crumbs, being careful not to bash too hard.
Make Oreo Crust: In a bowl, place the Oreo cookie crumbs. Next, place the butter in a saucepan and melt over a low heat, being careful not to let it burn. Once the butter has melted, pour it over the crumbs.
Prepare Cream Cheese and Cool Whip Layer: If your cream cheese is particularly firm, you can soften the cream cheese by microwaving it for 15 to 20 seconds, being careful to make sure that you’re not melting it.