Kicking off another hectic week, I know you’re searching for that magical dessert that feels special without requiring chef-level skills or hours of cleanup. Keep this Reese’s cake in your back pocket for those moments when you need to deliver serious chocolate-peanut butter joy with minimal effort. It’s the kind of recipe that makes you look like a superstar, even when you’re running on fumes.
Why This Recipe Works
- One-Bowl Wonder: Mix the entire cake batter in a single bowl to dramatically cut down on dishes and cleanup time.
- Pantry-Friendly Ingredients: Relies on common baking staples you likely already have, avoiding last-minute grocery store runs.
- Built-In Flavor Layers: Reese’s cups are mixed into the batter and used as a topping, creating multiple textures and intense peanut butter-chocolate flavor in every bite without extra steps.
- Forgiving Texture: The oil-based batter stays moist even if slightly overmixed or overbaked, making it perfect for distracted baking.
- Minimal Active Time: Most of the work is hands-off baking and cooling, freeing you up to tackle other tasks.
Ingredients
- 2 cups all-purpose flour
- 1 3/4 cups granulated sugar
- 3/4 cup unsweetened cocoa powder
- 2 teaspoons baking soda
- 1 teaspoon baking powder
- 1 teaspoon salt
- 2 large eggs, at room temperature
- 1 cup buttermilk, at room temperature
- 1/2 cup vegetable oil
- 2 teaspoons pure vanilla extract
- 1 cup hot coffee (or hot water)
- 24 mini Reese’s peanut butter cups, unwrapped and roughly chopped (divided)
- 1 cup creamy peanut butter
- 1/2 cup unsalted butter, softened to room temperature
- 2 cups powdered sugar
- 1/4 cup heavy cream or milk
- 1 teaspoon vanilla extract
- Pinch of salt
Equipment Needed
- 9×13 inch metal or glass baking pan
- Large mixing bowl
- Whisk or electric hand mixer
- Rubber spatula
- Measuring cups and spoons
- Cooling rack
- Medium bowl for frosting
Instructions
Step 1: Prep and Mix the Dry Ingredients
Preheat your oven to 350°F. Grab your 9×13 inch baking pan and lightly grease it with non-stick spray or a thin layer of butter—no need to flour it for this moist cake. In your large mixing bowl, whisk together 2 cups of all-purpose flour, 1 3/4 cups granulated sugar, 3/4 cup unsweetened cocoa powder, 2 teaspoons baking soda, 1 teaspoon baking powder, and 1 teaspoon salt. Whisk for a good 30 seconds until everything is evenly combined and you see no streaks of white flour or cocoa powder. This dry mix is your foundation, and taking a moment here ensures your cake rises evenly without any bitter pockets of baking soda. Tip: If your cocoa powder is lumpy, sift it directly into the bowl with the other dry ingredients to avoid clumps in your finished cake.
Step 2: Combine the Wet Ingredients and Finish the Batter
Step 3: Bake the Cake to Perfection
Pour the batter into your prepared 9×13 inch pan. Use the spatula to spread it into an even layer, gently tapping the pan on the counter once to release any large air bubbles. Place the pan in the center rack of your preheated 350°F oven. Bake for 30-35 minutes. Start checking at the 30-minute mark: the cake is done when a toothpick inserted into the center comes out with just a few moist crumbs attached, not wet batter. The top will look set and may have a few small cracks. Tip: Avoid opening the oven door before 25 minutes to prevent the cake from collapsing. Once baked, place the pan on a wire cooling rack and let the cake cool completely in the pan—this takes about 2 hours. Rushing this step will make your frosting melt.
Step 4: Whip Up the Peanut Butter Frosting
While the cake cools, make the frosting. In a medium bowl, combine 1 cup creamy peanut butter and 1/2 cup softened unsalted butter. Use an electric mixer on medium speed to beat them together for 2 minutes until completely smooth and creamy, scraping the bowl halfway through. With the mixer on low, gradually add 2 cups of powdered sugar, about 1/2 cup at a time, mixing well after each addition. Once all the sugar is incorporated, add 1/4 cup heavy cream (or milk), 1 teaspoon vanilla extract, and a pinch of salt. Increase the mixer speed to medium-high and beat for a full 2 minutes until the frosting is light, fluffy, and spreadable. If it seems too thick, add more cream 1 tablespoon at a time. Tip: For the smoothest frosting, ensure your butter is truly softened—it should dent easily when pressed, not be melted or cold.
Step 5: Frost, Decorate, and Serve
Once the cake is completely cool, spread the peanut butter frosting evenly over the top using an offset spatula or the back of a spoon. Don’t worry about making it perfectly smooth—rustic swirls are part of the charm. Sprinkle the remaining 12 chopped mini Reese’s cups over the frosting, pressing them in slightly so they stick. For easier slicing, you can chill the frosted cake in the refrigerator for 30 minutes. Cut into squares and serve directly from the pan. Store any leftovers covered at room temperature for up to 2 days or in the refrigerator for up to 5 days.
Tips and Tricks
If you’re out of buttermilk, make a quick substitute by adding 1 tablespoon of white vinegar or lemon juice to a liquid measuring cup, then filling it with milk to the 1-cup line. Let it sit for 5 minutes before using. For a cleaner cut, run a sharp knife under hot water and wipe it dry between slices. To save even more time, you can use a boxed chocolate cake mix—just prepare it according to package directions, fold in the chopped Reese’s cups, and bake as directed. If your family prefers less sweetness, reduce the powdered sugar in the frosting to 1 1/2 cups and add an extra pinch of salt to balance it. For a make-ahead option, bake and cool the cake up to a day in advance, wrap the pan tightly in plastic wrap, and frost just before serving.
Recipe Variations
- Reese’s Pieces Explosion: Swap the chopped mini cups in the batter for 1 cup of Reese’s Pieces. They’ll add a colorful crunch and the same peanut butter flavor.
- Chocolate Ganache Drizzle: Skip the peanut butter frosting. After the cake cools, pour over a simple ganache made by heating 1/2 cup heavy cream and pouring it over 1 cup of chocolate chips. Let it set before topping with chopped Reese’s.
- Peanut Butter Cup Blondie Base: For a non-chocolate version, use a vanilla or blondie batter. Prepare your favorite blondie recipe in the 9×13 pan, folding in the chopped Reese’s cups before baking.
- Mini Cake Version: Bake the batter in two 8-inch round pans for 25-28 minutes to create a layer cake. Double the frosting recipe to fill and cover the layers.
- Gluten-Free Adaptation: Replace the all-purpose flour with a 1:1 gluten-free baking blend. Ensure your baking powder and cocoa powder are certified gluten-free.
Frequently Asked Questions
Can I use natural peanut butter for the frosting? I don’t recommend it for this recipe. Natural peanut butter tends to be oilier and can separate, leading to a greasy, less stable frosting. Stick with conventional creamy peanut butter like Jif or Skippy for the best consistency and flavor.
My cake sunk in the middle. What happened? This usually means it was underbaked, the oven door was opened too early, or there was too much leavening. Ensure your baking soda and powder are fresh, avoid opening the oven before 25 minutes, and use the toothpick test to confirm doneness. It’ll still taste great!
Can I freeze this cake? Absolutely. Freeze the unfrosted, cooled cake tightly wrapped for up to 3 months. Thaw overnight in the refrigerator, then bring to room temperature before frosting. You can also freeze frosted slices individually on a baking sheet, then transfer to a container.
What can I use instead of coffee? The coffee enhances the chocolate flavor without making it taste like coffee. If you prefer to avoid it, use an equal amount of hot water. The cake will still be delicious, just with a slightly milder chocolate taste.
How do I get the Reese’s cups to chop without sticking? Pop them in the freezer for 15 minutes before chopping. Use a sharp knife and a cutting board—they’ll chop cleanly without turning into a sticky mess.
Summary
This Reese’s cake delivers maximum peanut butter-chocolate satisfaction with minimal kitchen chaos. It’s a one-bowl, pantry-friendly dessert perfect for busy families needing a reliable treat.
