Preheat oven to 350 or 325 if using a glass pan. Grease a 9 x 13 pan.
Mix together the chocolate cake mix, egg, water and melted butter. Spread out in the bottom of prepared pan.
Add the cookies, pressing down lightly. You should still see the frosting.
Mix together the cream cheese, eggs, cocoa, peanut butter and melted butter. When thoroughly mixed in add the confectioner's sugar and vanilla. Spread over the cookies.
Bake for about 60 minutes. Start checking at 50 minutes. A tester will pull out clean and the center be puffy when it's done.
Recipe by Recipes Food and Cooking at https://recipesfoodandcooking.com/2015/06/01/peanut-butter-oreo-chocolate-ooey-gooey-butter-cake/