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Decadent Homemade Dark Chocolate Cake with Strawberry Buttercream

1 from 1 vote
Rich, moist dark chocolate cake paired with fresh strawberry buttercream and luscious chocolate ganache—perfect for celebrations and special treats.
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Prep Time 20 minutes
Cook Time 35 minutes
Total Time 1 hour 30 minutes
Servings: 12 servings
Course: Dessert
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

For the Chocolate Cake
  • 3 cups all-purpose flour base for a tender crumb
  • 3 cups sugar balances the dark cocoa
  • 1.5 cups special dark cocoa powder gives the cake rich chocolate depth
  • 0.5 cup unsweetened cocoa powder adds extra chocolatey punch
  • 1 tbsp baking powder helps the cake rise
  • 1.5 tsp baking soda helps the cake rise
  • 1.5 tsp kosher salt enhances all flavors
  • 4 large eggs adds structure and moisture
  • 0.5 cup sour cream keeps cake moist and tender
  • 1 cup buttermilk adds subtle tang and fluffiness
  • 1 cup warm water + ½ tsp espresso powder espresso intensifies chocolate flavor
  • 0.5 cup Kahlua optional, adds boozy coffee-chocolate note
  • 0.5 cup canola oil keeps cake ultra-moist
  • 1 tbsp vanilla extract adds warmth and roundness
For the Strawberry Buttercream
  • 2 cups unsalted butter softened, creamy base for frosting
  • 6 cups powdered sugar sweetens and thickens buttercream
  • 4 tsp vanilla extract brings out strawberries' natural sweetness
  • 0.5 cup very finely diced strawberries patted dry, adds fresh flavor and speckled look
  • 5-7 tbsp heavy whipping cream adjusts frosting texture
For the Chocolate Ganache
  • 1 cup semi-sweet chocolate chips smooth, melty chocolate glaze
  • 0.5 cup heavy whipping cream creates silky, luscious ganache
For Garnish
  • fresh strawberries adds fresh, colorful finish and juicy bite

Equipment

  • 3 9-inch cake pans
  • Large Mixing Bowl
  • Electric mixer or stand mixer
  • Wire rack
  • Saucepan
  • Whisk
  • Spatula

Method
 

  1. Step 1: Preheat oven to 350°F (175°C) and grease three 9-inch cake pans to help cakes release easily.
  2. Step 2: In a large bowl, whisk together flour, sugar, special dark cocoa powder, unsweetened cocoa powder, baking powder, baking soda, and salt until evenly combined.
  3. Step 3: Add eggs, sour cream, buttermilk, warm water mixed with espresso powder, canola oil, vanilla extract, and Kahlua. Mix just until combined to avoid dense cake.
  4. Step 4: Divide batter evenly among prepared pans using a scale or measuring cup for even layers.
  5. Step 5: Bake for 25–35 minutes or until a toothpick inserted in center comes out with a few moist crumbs. Begin checking at 25 minutes.
  6. Step 6: Let cakes cool in pans for 20 minutes to set, then remove and cool completely on wire racks.
  7. Step 7: Beat softened butter until fluffy (3-5 minutes). Gradually add powdered sugar and vanilla extract, then fold in finely diced, patted dry strawberries. Add heavy cream one tablespoon at a time, beating until thick and airy.
  8. Step 8: Once cakes are cooled, assemble by placing one layer on serving plate, spreading generous buttercream layer, and repeating with remaining layers.
  9. Step 9: Frost outside of cake smoothly with remaining buttercream. Rustic finish is acceptable.
  10. Step 10: Prepare ganache by heating heavy cream until steaming, pouring over chocolate chips, letting sit 1 minute, then whisking until smooth and glossy.
  11. Step 11: Allow ganache to cool slightly until thick but pourable. Pour over cake, letting it drip down edges for elegant finish.
  12. Step 12: Pipe additional frosting swirls on top and garnish with fresh strawberries. Serve immediately.

Notes

Store cake covered in refrigerator for up to 3 days due to fresh strawberries in buttercream. For freezing, wrap tightly in plastic wrap and foil; freeze up to 2 months. Thaw overnight in refrigerator before serving. Substitute Kahlua with strong brewed coffee or omit. Use coconut cream for dairy-free option. Add chocolate chips, nuts, or raspberry jam for texture and flavor variations.