The most extraordinary three-layer Chocolate Oreo Cake made by preheating oven to 350°F greasing and lining three 8-inch pans whisking 1 3/4 cups flour 3/4 cup Dutch cocoa 2 tsp baking soda 1 tsp baking powder 1 tsp salt and 2 cups sugar adding 2 room temperature eggs 1 cup room temperature sour cream 1/2 cup oil and 2 tsp vanilla mixing combined carefully stirring in 1 cup hot brewed coffee batter will be thin dividing evenly baking 22 to 25 minutes until toothpick shows few moist crumbs cooling completely processing 20 whole Oreos with filling to fine crumbs beating 1 1/2 cups room temperature butter 3 minutes pale and fluffy adding Oreo crumbs beating incorporated gradually adding 4 to 5 cups sifted powdered sugar cream vanilla and salt beating 3 minutes incredibly fluffy making ganache from 1/4 cup heated cream poured over 4 oz chips whisked smooth assembling three layers with Oreo buttercream crumb coating refrigerating 20 minutes applying final frosting pouring cooled ganache for dramatic drip pressing whole Oreos into exterior and scattering crushed crumbs. A completely perfect three-layer Dutch cocoa sour cream coffee Oreo crumb buttercream ganache drip chocolate Oreo celebration cake recipe.