Preheat oven to 350℉. Grease a bundt pan and dust it with cocoa powder; set aside.
Add the cake mix, pudding mix and mini chocolate chips to a large mixing bowl; set aside.
One box Devil's food cake mix, One 3.9 ounce packet instant chocolate pudding mix, 1/2 cup mini chocolate chips
Add the Oreos, sour cream, eggs, hot water (or coffee) and vegetable oil to a food processor.
20 Oreo cookies, 1 cup sour cream, 4 eggs, 3/4 cup hot water or coffee, 3/4 cup vegetable oil
Blend until smooth
Pour the Oreo mixture into the bowl with the mixes and stir until well-combined.
Spoon the batter into the prepared pan and bake for 50-60 minutes or until a toothpick pressed into the center of the bundt cake comes out clean or with just a few moist crumbs.
Let the cake cool for 5 minutes. Run a small rubber spatula around the edge of the pan (outer edge and inner circle) and invert onto a cooling rack to cool completely.