Chocolate Oreo Sheet Cake
As a kid, I grew up obsessed with Oreos. And honestly? Nothing has changed. I still find myself sneaking a few when no one is looking, savoring that perfect combo of chocolate cookie and sweet cream filling. So when I thought up this Chocolate Oreo Sheet Cake recipe, I knew I had to share it with the world.
Because what’s better than combining your favorite childhood cookie with a rich, moist chocolate cake and decadent chocolate buttercream? The answer: nothing. Absolutely nothing.
This cake is basically everything I love in dessert form. Fluffy, chocolatey, and perfectly sweet, it’s topped with a creamy, Oreo-studded chocolate buttercream that makes every bite feel indulgent and nostalgic.
It’s the kind of dessert that makes people smile before they even take a bite — the visual of crushed Oreos sprinkled on top is basically a promise of chocolate bliss.
Baking this chocolate Oreo sheet cake is also super easy. No complicated layers, no fancy piping skills required. Just pour the batter, bake, whip up the buttercream, and go to town.
Perfect for birthdays, game nights, potlucks, or just a random Tuesday when life needs a little chocolate therapy.
Ingredients
For the Cake:
- 1 ¾ cups granulated sugar
- ¾ cup dark or black cocoa powder
- 2 cups all-purpose flour
- 1 ½ teaspoons baking soda
- 2 teaspoons baking powder
- 1 teaspoon salt
- ¾ cup neutral oil (canola, vegetable, or sunflower oil)
- 3 large eggs, room temperature
- 1 cup buttermilk
- ½ cup strongly brewed coffee, cooled
For the Chocolate Buttercream:
- 1 cup unsalted butter, room temperature
- 1 cup cocoa powder
- 4 cups powdered sugar
- 1 tbsp vanilla extract
- 1/2 teaspoon salt
- 3 tablespoons milk or cream
- 1 cup crushed Oreos
🧁 Directions
Step 1: Bake the Cake
Preheat your oven to 350°F and grease a 9×13-inch pan. Line it with parchment paper for easy removal. In a large bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt. In another bowl, combine oil, eggs, and buttermilk until smooth. Slowly mix the wet into the dry, then stir in the cooled coffee — it deepens the chocolate flavor without tasting like coffee. Pour the batter into the pan and bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean. Cool completely.
Step 2: Make the Chocolate Oreo Buttercream
Beat the butter until creamy, then mix in cocoa powder. Gradually add powdered sugar, alternating with milk or cream, until fluffy and spreadable. Beat in vanilla and salt. Fold in the crushed Oreos, leaving little chunks for texture. Spread over the cooled cake and sprinkle extra Oreo crumbs on top.
💬 Why You’ll Love This Cake
The combination of rich chocolate cake and cookies-and-cream frosting is a total nostalgia trip. The cake is moist thanks to the oil and buttermilk, the coffee enhances the chocolate flavor, and the Oreo buttercream brings that creamy, slightly crunchy, indulgent element that makes you want seconds (and maybe thirds).
Every time I bake this, I’m reminded of sneaking Oreos from the pantry as a kid and how comforting that little ritual was. This cake is like a grown-up version of that joy — perfect for celebrations, dessert cravings, or whenever chocolate therapy is required.
🥄 Make-Ahead & Storage
Bake the cake a day ahead and frost the next day — flavors meld and the cake tastes even better. Store leftovers covered at room temperature for up to 2 days, or in the fridge for up to 5. Reheat slices in the microwave for 10 seconds for that freshly baked, gooey frosting feeling.
✨ Final Thoughts
This Chocolate Oreo Sheet Cake is an easy, crowd-pleasing dessert that’s rich, chocolatey, and packed with Oreos — basically everything I loved as a kid in a grown-up, shareable cake. Whether it’s a birthday, holiday, or a Wednesday that just needs a little chocolate love, this cake delivers every single time.