This Oreo Dump Cake layers whole Oreo cookies, sweetened condensed milk, whipped topping, and chocolate cake mix into an easy, rich dessert that bakes up gooey and chocolatey with almost no effort.
Preheat oven to 350°F and lightly coat a 9x13-inch baking dish with nonstick cooking spray.
Open the 24-ounce package of Oreos and line the cookies in a single layer across the bottom of the baking dish, filling the surface with whole cookies edge to edge.
Pour the entire 14-ounce can of sweetened condensed milk in slow ribbons over the Oreo layer, covering the cookies as evenly as possible.
Spoon the thawed 8-ounce tub of whipped topping over the condensed milk layer, then gently spread it into an even layer without mixing the layers.
Sprinkle (1) 15.25-ounce box of chocolate fudge cake mix evenly across the whipped topping layer. Gently rake it with a fork to make sure it is evenly distributed. Do not stir.
Pour 1 cup melted unsalted butter over the entire cake mix layer, slowly and evenly, moving back and forth to cover as much of the dry surface as possible. Check the surface for any dry areas of cake mix and drizzle a little extra melted butter over those spots so they can bake evenly and fully absorb.
Roughly chop some of the remaining Oreos in the package and scatter them evenly over the top of the melted butter layer.
Bake for 35-40 minutes, or until the top is set and lightly crisp, and the edges are bubbly.
Cool for 10 minutes to allow the layers to firm up slightly.
Scoop or slice into portions. Serve with ice cream or fresh whipped cream and garnish with a few more chopped Oreo cookies. ENJOY!
Video
Notes
To prevent dry cake mix topping after baking: Pour the melted butter slowly and evenly to prevent dry, powdery spots in the cake mix. Sometimes I'll even slightly press down after pouring the butter on to make sure the cake mix soaks in that butter, but don't mix them.