Desserts
This chocolate cake with chocolate buttercream frosting recipe delivers decadent layers of rich cocoa flavor that’ll satisfy even the most serious dessert lovers. The secret lies in a precise balance of cocoa powder, melted butter, and buttermilk—creating a moist, fudgy cake that stays tender long after baking.
I’ve perfected this recipe over years of testing, ensuring every slice has that perfect velvety crumb and smooth frosting that melts in your mouth.
The cake itself bakes up with a deep chocolate aroma that fills your kitchen, while the buttercream—made with powdered sugar, softened butter, and extra cocoa—adds a luxurious finish. What makes this recipe stand out is the foolproof technique for layering and frosting, ensuring clean slices every time.
Whether you’re baking for a celebration or just craving something indulgent, this dessert delivers restaurant-quality results at home.
With three simple steps—mixing the batter, baking the layers, and assembling with frosting—you’ll have a showstopping cake ready in under two hours. The buttercream isn’t just sweet; it’s rich and slightly tangy, thanks to a touch of vanilla and a pinch of salt.
This is the kind of dessert that makes people ask for seconds, and once you try it, you’ll never go back to store-bought again.
For extra depth, consider adding espresso powder to the batter or toasted nuts to the frosting—both elevate the chocolate flavor without overpowering it. Serve with a dusting of cocoa powder or fresh berries for contrast. Let’s get baking!
Ingredients for chocolate cake with chocolate buttercream frosting
Rich cocoa, velvety buttercream—just 15 ingredients for decadent layers that taste like a bakery secret.
| Ingredient | Amount | Notes |
|---|---|---|
| Unsalted Butter 🧈 | 1 cup | Softened to room temperature |
| Granulated Sugar 🍚 | 2 cups | White or light brown |
| Cocoa Powder 🍫 | ¾ cup | Natural or Dutch-processed |
| Buttermilk 🥛 | 1 cup | Room temperature preferred |
| Large Eggs 🥚 | 2 whole | Room temperature for even mixing |
| Vanilla Extract 🌿 | 2 tsp | Pure, high-quality extract |
| All-Purpose Flour 🌾 | 2 cups | Sifted for light texture |
| Baking Powder 🍞 | 1 ½ tsp | Aluminum-free preferred |
| Salt 🧂 | ½ tsp | Diamond Crystal kosher |
| Powdered Sugar 🍚 | 3 cups | For buttercream frosting |
| Softened Butter 🧈 | 1 cup | Room temperature for smooth frosting |
| Heavy Cream 🥛 | ½ cup | Cold for stability |
| Pure Vanilla Extract 🌿 | 1 tsp | For buttercream flavor |
| Espresso Powder ☕ | 1 tsp | Optional for depth (optional) |
| Toasted Walnuts 🌰 | ½ cup | Chopped for frosting garnish (optional) |
The cocoa powder is non-negotiable here—Hershey’s Special Dark or Valrhona if you’re splurging, but even the grocery store brand works if it’s fresh. The butter needs to be room temperature when you cream it with sugar (press a finger into it—it should leave a slight indent). Buttermilk should be at room temperature too, or the batter gets lumpy. I always grab Land O’Lakes buttermilk from the dairy case—it’s consistent and reliable. For the frosting, European-style butter like Plugrá gives the smoothest texture, but regular unsalted butter works in a pinch.
No buttermilk? Mix 1 tbsp lemon juice or vinegar with 1 cup milk and let it sit for 5 minutes. Short on cocoa powder? Add 1 tbsp melted chocolate to the batter for extra richness. The frosting can be made with powdered sugar from a box (like Domino), but if you’ve got a fine-mesh sieve, sift it first for a silky finish. Want more chocolate flavor? Add 1 oz melted dark chocolate to the frosting. The espresso powder is optional but adds that Starbucks-level depth—use instant espresso if that’s what you’ve got. For the walnuts, toast them in a dry pan for 3-4 minutes until fragrant.
This cake keeps beautifully—3 days at room temperature covered loosely, or 1 week refrigerated in an airtight container. The frosting can be made 2 days ahead and stored in the fridge; just re-whip it briefly before using. For extra presentation, dust the cake with cocoa powder or sprinkle with chopped toasted nuts right before serving. The buttercream freezes well too—thaw in the fridge overnight. If your cake sinks slightly in the middle, don’t stress—it’s still delicious. Just slice through the dip and serve with a smile.
Why You'll Love This Recipe
- Foolproof Mixing: I swear by the creaming method here—just butter, sugar, and cocoa powder beaten until light and fluffy. No sifting, no stress, and the cake turns out tender every single time.
- Rich Double Chocolate: That buttermilk keeps it moist, but the real star? The buttercream—smooth, velvety, and packed with cocoa powder for layers of chocolatey goodness. Honestly, it’s the kind of dessert that makes people groan in delight.
- Birthday Party Ready: No one will guess it’s basically a weeknight bake—just slice, serve, and watch it disappear. (Yes, even on a Tuesday night.) The frosting stays firm enough for piping, but it’s still easy enough to spread with a knife.
- Budget-Friendly Luxury: You’re using pantry staples here—no fancy ingredients, just good chocolate and butter. Makes two full 9-inch cakes, so you’ll have leftovers for days, and they taste just as amazing reheated with a sprinkle of powdered sugar.
Step-by-step instructions for deep chocolate layers with rich velvety frosting
Here's how to create a decadent chocolate cake with ultra-smooth buttercream—every layer packed with flavor.
Prepare the Cake Batter for Maximum Moisture
Preheat your oven to 350°F and grease two 8-inch round cake pans with the 1 cup unsalted butter, coating the bottoms and sides thoroughly. Line the bottoms with parchment circles for easy removal. In a medium bowl, whisk together the 2 cups granulated sugar, 0.75 cup cocoa powder, 2 cups all-purpose flour, 1.5 teaspoons baking powder, and 0.5 teaspoon salt. This dry mixture should be completely smooth with no lumps—sift it if needed.
In a separate large bowl, beat the 2 whole large eggs and 1 cup buttermilk until just combined, then gradually add the dry ingredients while mixing on low speed. The batter will be thick and fudgy—this is perfect. Fold in the 2 teaspoons vanilla extract until evenly distributed. Divide the batter evenly between your prepared pans, spreading it out to create level tops. Tap the pans gently on the counter to release any air bubbles.
Bake Until Springy and Cool Completely
Bake the cakes for 30-35 minutes, or until a toothpick inserted into the center comes out with just a few moist crumbs (not wet batter). The edges should be set while the centers remain slightly springy. Rotate the pans halfway through baking for even browning. Let the cakes cool in their pans for 10 minutes, then transfer them to a wire rack to cool completely. This cooling step is critical—warm layers will make your frosting melt and slide off.
While the cakes cool, prepare your work surface. I like to place a sheet of parchment paper underneath the cakes to catch any crumbs. Once completely cool, run a thin knife or offset spatula around the edges of each cake to release them from the pans. This makes leveling the layers much easier later. For extra insurance, chill the cakes in the freezer for 15 minutes to firm up before frosting.
Create Ultra-Smooth Chocolate Buttercream
In a stand mixer fitted with the paddle attachment, beat the 1 cup softened butter on medium speed until completely smooth and creamy—this should take about 2-3 minutes. Gradually add the 3 cups powdered sugar, mixing on low speed until combined, then increase to medium and beat for another 3 minutes until light and fluffy. Scrape down the sides of the bowl as needed to ensure even mixing.
Add the 0.5 cup heavy cream, 1 teaspoon pure vanilla extract, and 1 teaspoon espresso powder (if using) to the buttercream mixture. Beat on medium speed for 2-3 minutes until fully incorporated and the frosting reaches a smooth, pipeable consistency. The espresso powder enhances the chocolate flavor without making the frosting taste like coffee—just a subtle depth. Taste and adjust sweetness if needed by adding small amounts of powdered sugar.
Assemble Layers with Crisp Edges
Place the first cake layer on your prepared surface and spread a thin layer of buttercream (about ¼ inch) over the top. This "crumb coat" prevents crumbs from getting into your final frosting. Place the second layer on top and repeat the crumb coat process on the top and sides. Chill the assembled cake in the refrigerator for 15 minutes to firm up the buttercream.
Once chilled, spread the remaining buttercream evenly over the top and sides of the cake using an offset spatula. For a professional finish, I like to use the "reverse piping" technique: pipe a border of buttercream around the edges, then fill the center with a spatula, smoothing as you go. Sprinkle the 0.5 cup toasted walnuts over the top while the frosting is still soft for easy adhesion. Let the cake sit at room temperature for 30 minutes before slicing to allow the frosting to set properly.
Pro Tips For Making Chocolate Cake With Chocolate Buttercream Frosting
- Melt the Butter Slowly: I used to dump cold butter into hot sugar and wonder why my frosting ended up grainy. Instead, melt the butter just until it’s liquid but not browned—about 30 seconds in the microwave, or until it’s soft enough to press between fingers. Then let it cool for 2 minutes before mixing with cocoa powder. This keeps the buttercream smooth without seizing up.
- Sift the Cocoa Twice: That first sift of cocoa powder? It’s not enough. After mixing it into the wet ingredients, sift it again through a fine-mesh sieve to break up any clumps. I learned this the hard way—lumpy frosting ruins everything, and you’ll taste the texture. Do this right before adding the butter to keep it fresh.
- Don’t Overmix the Batter: The moment the flour hits the buttermilk, stop mixing. Two seconds past that point and you’ll get a dense, tough cake. Use a spatula to gently fold until just combined—no streaks, no overworking. I was skeptical until I tried it: the cake stays moist and tender, not like a hockey puck.
- Use Room-Temp Eggs: Cold eggs? They’ll curdle the buttercream and make the cake sink in the middle. Take the eggs out of the fridge 30 minutes before using, or pop them in warm water for 5 minutes. The buttercream will pipe smoothly, and the cake will bake evenly—no surprise puddles in the center. Trust me, it’s worth the wait.
Troubleshooting this recipe
Cracked Cake Layers
If your cake cracks while baking, it’s usually due to overmixing the batter or opening the oven too soon. To prevent this, mix the batter just until combined—no need to overbeat. Also, avoid peeking at the cakes while they bake, as sudden temperature drops can cause cracks.
If cracks appear, don’t worry—they’re just surface-level and won’t affect flavor. Simply frost over them for a seamless finish. 💡
Dense or Dry Texture
A dense or dry cake often results from overbaking or using too much flour. Always check for doneness with a toothpick—it should come out with moist crumbs, not wet batter. For extra moisture, add 1 tablespoon sour cream or yogurt to the batter.
If your cake feels dry after baking, brush the layers lightly with simple syrup (½ cup warm water + ¼ cup sugar) before frosting. This adds moisture without altering the texture.
Frosting Too Soft
If your buttercream is too soft or melts too quickly, your butter might not have been chilled enough before whipping. Place the mixing bowl in the freezer for 5 minutes while beating, then continue whipping.
For extra stability, add 1 tablespoon cornstarch or powdered sugar to the frosting—this helps it hold its shape, especially in warm kitchens. Store frosted cakes in the fridge for up to 4 hours before serving to prevent melting.
Uneven Layers
Uneven layers happen when cakes cool unevenly or aren’t leveled properly. Always let cakes cool completely before frosting—this prevents the frosting from sliding off. Use a serrated knife or cake leveler to trim the tops of your cakes for even layers.
If one layer is thicker, place it on the bottom and the thinner layer on top. Chill the cake in the freezer for 10 minutes before frosting to help the buttercream adhere evenly.
Buttercream Too Thin
A runny frosting usually means too much liquid (like heavy cream) or not enough sugar. Gradually add 1 tablespoon powdered sugar at a time while mixing until the frosting reaches a thick, pipeable consistency. For a quick fix, place the bowl in the fridge for 10 minutes to firm up.
If the frosting is still too thin, try adding 1 tablespoon more softened butter and re-whipping. Avoid adding flour—it can make the frosting grainy.
Cake Sticks to Pans
If your cake sticks to the pan, it’s likely because the butter wasn’t melted enough or the pans weren’t greased properly. Next time, use a mix of butter and flour to coat the pans thoroughly—dip a pastry brush in melted butter, then dust with flour.
For extra insurance, line the pans with parchment circles and grease the parchment too. If the cake still sticks, run a thin knife around the edges while the cake is warm, then let it cool completely before removing.
Nutrition facts
Frequently asked questions
Can I substitute buttermilk in this chocolate cake recipe?
Mix 1 tablespoon lemon juice or vinegar with 1 cup milk and let it sit for 5 minutes to create a perfect buttermilk substitute. This keeps the cake's moisture and rich texture intact without altering the flavor.
How do I make the buttercream extra rich and fudgy?
For a deeper chocolate flavor, add 1 oz melted dark chocolate to your buttercream while mixing. Chill the frosting for 10 minutes before using to thicken it further. This creates a velvety, almost ganache-like texture that pairs perfectly with the cake layers.
Can I bake this cake in a different pan size?
Yes, but adjust the baking time accordingly. For 9-inch pans, bake for 25-30 minutes instead of 30-35. Use a toothpick test to check doneness—it should come out with moist crumbs, not wet batter. The cake will spread slightly in larger pans, so reduce oven temp to 340°F if needed.
Why did my cake sink in the middle?
This usually happens from overmixing the batter or opening the oven too soon. Mix just until combined and avoid peeking during baking. If it sinks slightly, don't worry—the cake is still delicious! Simply frost over the dip for a seamless finish. For next time, try chilling the batter for 15 minutes before baking.
How long can I store this frosted cake?
Keep the cake at room temperature for up to 3 days covered loosely, or refrigerate for 1 week in an airtight container. The buttercream can be made 2 days ahead and stored in the fridge—just re-whip briefly before using. For long-term storage, freeze the unfrosted layers for up to 3 months.