Name: Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 240 grams (2 cups) all purpose flour; 1 teaspoon baking soda; 1 teaspoon kosher salt; 170 grams (¾ cup; 6 ounces) unsalted butter, melted; 45 mL (3 Tablespoons) vegetable oil, neutral flavor; 300 grams (1½ cups) granulated sugar; 30 grams (¼ cup + 2 Tablespoons) Dutch process cocoa powder; 250 mL (1 cup) strong brewed hot coffee; 2 large eggs, room temperature; 120 grams (½ cup) full-fat sour cream; 1½ teaspoons vanilla extract; 66 grams (½ cup) walnuts, toasted and chopped; 188 mL (¾ cup; 6 ounces) heavy cream; 170 grams (6 ounces) dark chocolate (60% cacao), finely chopped; 33 grams (¼ cup) walnuts, toasted and chopped, to sprinkle on top

Jump to Recipe· 3.8 from 69 reviews

If you’re craving a dessert that perfectly balances rich chocolate and crunchy nuts, you’ve got to try this Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe. This one-layer cake is wonderfully moist and bursting with the deep flavor of toasted walnuts folded right into the batter, then crowned with a luxuriously smooth, whipped dark chocolate ganache. It’s one of those irresistible cakes that’s as lovely for a cozy afternoon treat as it is for impressing guests, and once you make it, you’ll keep coming back for more.

Ingredients You'll Need

A top view of a metal sieve filled with white flour, placed on a white bowl, with a white wooden spoon resting inside the flour. The sieve and bowl sit on a white marbled surface with light brown texture and some white flour spots scattered around. photo taken with an iphone --ar 4:5 --v 7

Gathering the ingredients for this Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe is delightfully straightforward. Each item plays a key role, from the cocoa powder that gives the cake its rich depth to the sour cream that ensures tender moistness. The walnuts provide a toasty crunch that complements the silky ganache topping beautifully.

240 grams (2 cups) all purpose flour: The base that gives the cake its structure.
1 teaspoon baking soda: Helps the cake rise for a soft crumb.
1 teaspoon kosher salt: Enhances all the chocolate flavors.
170 grams (¾ cup; 6 ounces) unsalted butter, melted: Adds rich moisture and buttery goodness.
45 mL (3 Tablespoons) vegetable oil, neutral flavor: Keeps the cake tender.
300 grams (1½ cups) granulated sugar: Sweetens the cake perfectly without overpowering.
30 grams (¼ cup + 2 Tablespoons) cocoa powder, Dutch process: Imparts a deep, intense chocolate flavor.
250 mL (1 cup) coffee, strongly brewed, hot: Boosts and enriches the chocolate taste without adding bitterness.
2 large eggs, room temperature: Bind ingredients and provide lift.
120 grams (½ cup) sour cream, full fat: Makes the crumb tender and moist.
1½ teaspoons vanilla extract: Adds warm, inviting aroma and flavor.
66 grams (½ cup) walnuts: Toasted and mixed into the batter for crunch and nuttiness.
188 mL (¾ cup; 6 ounces) heavy cream: For making the luscious whipped dark chocolate ganache.
170 grams (6 ounces) dark chocolate, finely chopped: High-quality 60% dark chocolate gives richness to the ganache.
33 grams (¼ cup) walnuts: Toasted and sprinkled on top for an extra nutty finish.

How to Make Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe

Step 1: Prepare Your Oven and Walnuts

Preheat your oven to 350° F (177° C). Line an 8-inch square cake pan with parchment paper on the bottom and sides to ensure easy cake removal later. Start by toasting all the walnuts on a rimmed baking sheet for 5 to 8 minutes. Toasting intensifies their flavor and crunch, but be sure to watch carefully so they don’t burn, as burnt walnuts develop bitterness. Once toasted, let them cool and chop into small pieces.

Step 2: Mix Dry Ingredients

In a medium bowl, sift together the all purpose flour, baking soda, and kosher salt. This step ensures your dry ingredients are evenly combined and helps avoid lumps, setting the stage for a perfectly textured cake.

Step 3: Combine Wet Ingredients and Chocolate

In a large mixing bowl, whisk together the melted butter, vegetable oil, granulated sugar, and Dutch process cocoa powder until smooth and well incorporated. Then carefully whisk in the hot, strong brewed coffee. The coffee enhances and deepens the chocolate flavor without making the cake taste like coffee.

Step 4: Add Eggs, Dry Ingredients, and Sour Cream

Beat in the eggs one at a time, whisking well after each addition to create a smooth and glossy batter. Next, add the sifted flour mixture and whisk again until fully incorporated. Scrape down the sides of the bowl to ensure no pockets of flour remain. Finally, fold in the sour cream and vanilla extract, whisking gently until the batter is smooth and luscious.

Step 5: Fold in Walnuts and Bake

Gently fold half of the toasted, chopped walnuts into the batter to distribute the nutty crunch throughout the cake. Pour the batter into your prepared pan and tap the pan firmly on the counter to release any air bubbles. Bake on the center rack for about 45 to 50 minutes, or until a toothpick inserted in the center comes out clean, the cake springs back lightly when touched, and it begins to pull away from the edges of the pan. Let the cake cool in the pan for 10-15 minutes before turning out onto a wire rack to cool completely.

Step 6: Make the Whipped Dark Chocolate Ganache

To make the ganache topping, heat the heavy cream in a microwave-safe container or a small saucepan until it just begins to simmer—do not boil. Pour the hot cream over the finely chopped dark chocolate and let it sit for 2 to 3 minutes, allowing the chocolate to melt gently. Then whisk until smooth, glossy, and lump-free. Cool to room temperature—this can be sped up by chilling briefly in the refrigerator for short intervals, whisking every 10 minutes to keep it smooth. The ganache should not be cold, just room temperature for best whipping results.

Step 7: Whip Ganache and Finish Cake

Transfer the cooled ganache to a stand mixer bowl fitted with a whisk attachment. Whisk on high speed for about 1 minute until it becomes lighter in color, fluffy, and holds firm peaks. Be careful not to overwhip, or the ganache will turn grainy. Spread the whipped ganache evenly across the top of the cooled cake using a small offset spatula. Finally, sprinkle the remaining toasted walnuts over the top for a beautiful and crunchy finish.

How to Serve Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe

The image shows a rich, dark chocolate brownie cut into six square pieces, with one piece slightly separated at the bottom. Each brownie piece has a thick, smooth layer of dark chocolate frosting on top, decorated with small chunks of walnuts scattered evenly across the surface. The brownies rest on brown parchment paper, placed on a white marbled surface. Nearby, there is a white plate filled with halved and whole walnuts, while whole walnuts and walnut pieces are scattered around the brownies. A knife with a cream-colored handle, smeared with chocolate, lies on the bottom right corner. A rolling pin handle is visible on the upper left side. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Sprinkling extra toasted walnuts on top adds texture and a nutty aroma that complements the rich chocolate perfectly. You could also add a pinch of flaky sea salt or a light dusting of cocoa powder for added depth. Fresh raspberries or a few mint leaves on the side brighten the plate and add a refreshing contrast to the decadent cake.

Side Dishes

This cake pairs beautifully with simple accompaniments like a scoop of vanilla bean ice cream or a dollop of lightly sweetened whipped cream. If you're feeling adventurous, try a spoonful of raspberry or cherry compote to add fruity brightness that cuts through the richness. A warm cup of freshly brewed coffee or black tea also enhances the chocolate’s flavor and creates the ultimate indulgence experience.

Creative Ways to Present

For a stunning reveal, cut the cake into generous squares and arrange them on a beautiful wooden board or cake stand. If serving for a special treat, pipe some extra whipped ganache alongside the slices or drizzle a bit of chocolate sauce over the top for an elegant look. Garnishing each slice with a whole toasted walnut or a fresh berry adds charm and invites eager bites.

Make Ahead and Storage

Storing Leftovers

This Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe keeps well at room temperature for up to two days if covered with a cake dome or airtight container. For longer storage, refrigerate the cake, tightly wrapped or covered, for up to five days. Keep in mind the ganache’s whipped texture is best enjoyed fresh and slightly chilled.

Freezing

You can freeze the cake before adding the ganache by wrapping it tightly in plastic wrap and then aluminum foil—freeze for up to one month. When ready to serve, thaw fully at room temperature, then whip fresh ganache and spread just prior to serving for best texture and flavor. Avoid freezing the cake with whipped ganache on top, as the texture of the frosting may change.

Reheating

This cake is fantastic served slightly warm to bring out the chocolate aromas. If refrigerated, remove a slice and let it come to room temperature or warm gently in the microwave for 15-20 seconds. Enjoy it with a coffee or milk for a comforting treat. Avoid reheating too long to preserve the moist crumb and ganache texture.

FAQs

Can I substitute sour cream in this recipe?

Yes, you can substitute sour cream with plain Greek yogurt of the same quantity, which will provide similar moisture and slight tanginess without altering the cake’s texture significantly.

What type of dark chocolate is best for the ganache?

A good-quality dark chocolate with around 60% cocoa content works beautifully; it’s rich but not overly bitter, giving the ganache a smooth, luxurious flavor.

Can I make this cake gluten-free?

To make it gluten-free, replace the all purpose flour with a 1:1 gluten-free baking flour blend that contains xanthan gum for structure. The texture might differ slightly but the flavor will remain delicious.

How long does the ganache need to cool before whipping?

The ganache should be cooled to room temperature and slightly thickened but still soft enough to whisk easily—chilling in the fridge for short intervals with frequent whisking is ideal to reach this consistency.

Is it necessary to use coffee in the cake?

While coffee enhances the chocolate flavor, you can substitute it with hot water if you prefer. The cake will still be moist and chocolaty, just with a slightly less complex flavor.

Final Thoughts

This Chocolate Walnut Cake with Whipped Dark Chocolate Ganache Recipe is a true crowd-pleaser that combines the best of moist chocolate cake and silky frosting with the delightful crunch of toasted nuts. Whether you’re baking for a special occasion or a cozy moment at home, this recipe is sure to bring joy and smiles around the table. So go ahead, gather your ingredients, and treat yourself to a slice of pure chocolatey heaven—you deserve it.