Velvety Chocolate Stout Cake With Deep Malty Flavor

Quick Recipe Version (TL;DR)

• Yield: 12 servings (one 2-layer 9-inch cake)
• Prep Time: 30 minutes
• Cook Time: 35 minutes
• Total Time: 1 hour 20 minutes (plus cooling)

Quick Ingredients

• 1 bottle (12 fl oz / 355 ml) stout beer, divided
• 1 cup (225 g) unsalted butter, plus 1 1/2 cups (340 g) for frosting
• 1 1/2 cups (150 g) unsweetened cocoa powder, divided
• 2 cups (400 g) granulated sugar
• 3/4 cup (180 g) sour cream
• 2 large eggs
• 1 tbsp vanilla extract (plus 1 tsp for frosting)
• 2 cups (240 g) all-purpose flour
• 2 1/2 tsp baking soda + 3/4 tsp fine salt
• 3 1/2 cups (420 g) powdered sugar
• 3–5 tbsp heavy cream
• Optional garnish: dark chocolate shavings, cocoa powder, flaky sea salt

Do This

• 1. Heat 1 1/4 cups stout with 1 cup butter until melted; whisk in 3/4 cup cocoa until smooth, then cool slightly.
• 2. Whisk sugar, sour cream, eggs, and vanilla; slowly whisk in the warm stout-cocoa mixture.
• 3. Sift flour, baking soda, and salt; gently whisk into wet ingredients just until combined.
• 4. Divide batter between two greased and lined 9-inch pans; bake at 350°F (175°C) for 32–35 minutes, then cool completely.
• 5. Beat 1 1/2 cups softened butter; add powdered sugar, 3/4 cup cocoa, 1/4 cup stout, vanilla, salt, and enough cream for a smooth, fluffy frosting.
• 6. Level cooled cakes if needed; stack with frosting between layers and over top and sides, then swirl decoratively.
• 7. Garnish with chocolate shavings or a light cocoa dusting; slice and enjoy at room temperature.

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Why You’ll Love This Recipe

• Deep, intense chocolate flavor boosted by dark stout beer for a grown-up, bakery-style cake.
• Moist, almost velvety crumb with subtle malty undertones that stay tender for days.
• Silky chocolate stout buttercream that is rich but not overly sweet.
• Simple, straightforward method that looks impressive but is very doable for home bakers.

Grocery List

• Produce: None needed.
• Dairy: Unsalted butter, sour cream, heavy cream.
• Pantry: Stout beer, all-purpose flour, granulated sugar, powdered sugar, unsweetened cocoa powder, vanilla extract, baking soda, fine salt, optional dark chocolate bar, optional flaky sea salt.

Full Ingredients

For the Chocolate Stout Cake

• 1 bottle (12 fl oz / 355 ml) stout beer (such as a dry Irish stout), divided
• 1 cup (225 g) unsalted butter, cut into cubes
• 3/4 cup (75 g) unsweetened cocoa powder (natural or Dutch-process)
• 2 cups (400 g) granulated sugar
• 3/4 cup (180 g) sour cream, at room temperature
• 2 large eggs, at room temperature
• 1 tbsp pure vanilla extract
• 2 cups (240 g) all-purpose flour, spooned and leveled
• 2 1/2 tsp baking soda
• 3/4 tsp fine sea salt or table salt

For the Chocolate Stout Buttercream

• 1 1/2 cups (340 g) unsalted butter, very soft but not melted
• 3 1/2 cups (420 g) powdered sugar, sifted
• 3/4 cup (75 g) unsweetened cocoa powder
• 1/4 cup (60 ml) stout beer (from the same bottle you used for the cake)
• 3–5 tbsp (45–75 ml) heavy cream, as needed for consistency
• 1 tsp pure vanilla extract
• 1/4 tsp fine sea salt (or to taste)

Optional Garnish

• 1–2 squares dark chocolate, shaved into curls
• Unsweetened cocoa powder, for light dusting
• Pinch of flaky sea salt, sprinkled lightly over the top

Step-by-Step Instructions

Step 1: Prepare pans and preheat the oven

Preheat your oven to 350°F (175°C) with a rack in the center. Grease two 9-inch (23 cm) round cake pans with butter or nonstick spray. Line the bottoms with parchment rounds, then lightly grease the parchment as well. This helps the very moist cake release cleanly.

Dust the sides of the pans with a little cocoa powder or flour, tapping out any excess. Set the pans aside. Bring the sour cream and eggs out of the fridge so they can start to come to room temperature while you prepare the batter.

Step 2: Make the stout-cocoa mixture

Pour 1 1/4 cups (295 ml) of the stout into a medium saucepan (reserve the remaining 1/4 cup / 60 ml for the frosting). Add 1 cup (225 g) unsalted butter. Warm over medium heat until the butter is completely melted and the mixture is steaming, but not boiling.

Remove the pan from the heat and immediately whisk in 3/4 cup (75 g) cocoa powder until the mixture is completely smooth, glossy, and lump-free. This “blooming” step deepens the chocolate flavor. Set aside to cool until just warm to the touch, about 10 minutes.

Step 3: Mix the cake batter

In a large mixing bowl, whisk together the granulated sugar, sour cream, eggs, and vanilla extract until smooth and well combined. The mixture should look thick and creamy.

Slowly pour the warm (not hot) stout-cocoa mixture into the bowl, whisking constantly until everything is fully blended and uniform in color.

In a separate bowl, sift together the flour, baking soda, and salt. Add this dry mixture to the wet ingredients in two additions, gently whisking or folding with a spatula just until you no longer see dry flour. The batter will be quite thin and pourable; that is exactly what you want for a moist, velvety crumb. Avoid overmixing.

Step 4: Bake the cake layers

Divide the batter evenly between the two prepared pans. For accuracy, you can weigh the filled pans, or simply eyeball the levels. Smooth the tops lightly with a spatula if needed.

Bake at 350°F (175°C) for 32–35 minutes, or until the cakes have risen, the tops spring back lightly when touched, and a toothpick inserted into the center comes out with just a few moist crumbs, not wet batter.

Place the pans on a wire rack and let the cakes cool in the pans for 15 minutes. Then run a thin knife around the edges, invert each layer onto the rack, peel off the parchment, and allow to cool completely, at least 1 hour. Cool layers are essential for firm, clean frosting.

Step 5: Make the chocolate stout buttercream

Once the cakes are almost cool, prepare the frosting. In a large bowl (or the bowl of a stand mixer), beat the softened 1 1/2 cups (340 g) butter on medium speed for 2–3 minutes until very smooth, pale, and creamy.

Add the sifted powdered sugar, cocoa powder, salt, vanilla, and 1/4 cup (60 ml) stout. Start mixing on low speed so the dry ingredients do not puff everywhere, then increase to medium-high and beat for 2–3 minutes. Gradually add 3–5 tablespoons heavy cream, 1 tablespoon at a time, until the frosting is fluffy, silky, and easily spreadable but still holds soft peaks.

Taste and adjust: add a pinch more salt to sharpen the chocolate flavor, or a spoonful more powdered sugar if you prefer a sweeter, slightly stiffer frosting.

Step 6: Assemble and decorate the cake

If the cake layers are domed, level them gently with a long serrated knife. Place one layer, cut-side up, on a serving plate or cake stand. Spread about 1 cup of frosting evenly over the top, going right to the edges.

Place the second layer on top, cut-side down, and press lightly to set. Apply a thin “crumb coat” of frosting over the top and sides of the cake, smoothing it with an offset spatula or knife. Chill the cake for 15–20 minutes to set the crumb coat; this keeps crumbs from showing in the final layer.

Once set, spread the remaining frosting generously over the top and sides, swirling it into soft waves or clean lines, however you like. For garnish, add chocolate curls around the top edge, a light dusting of cocoa powder, and/or a tiny sprinkle of flaky sea salt to highlight the malty, chocolatey flavors.

Step 7: Serve and enjoy

For the best texture and flavor, let the finished cake stand at room temperature for about 20–30 minutes before slicing. Use a sharp, thin knife, wiping it between cuts for neat slices. The interior should look deeply dark, moist, and tender with a generous layer of chocolate stout frosting.

Serve on its own, or with a small dollop of lightly sweetened whipped cream or a scoop of vanilla ice cream if you want extra contrast. The stout notes are gentle and mellow, so this cake is crowd-friendly even for people who do not usually drink beer.

Pro Tips

• Use room-temperature dairy and eggs. Cold ingredients do not blend as smoothly and can cause the batter to separate slightly, affecting the texture.
• Do not boil the stout. Gentle heating is enough to melt the butter and bloom the cocoa without cooking off too much of the flavor.
• Weigh your flour if possible. Using more flour than needed can make the cake dense. Aim for about 240 g total.
• Resist overbaking. Pull the cakes as soon as a toothpick comes out with moist crumbs. Overbaking will dry out that velvety crumb.
• Beat the frosting well. Extra whipping time makes the buttercream light, fluffy, and easy to spread, even though it is richly chocolatey.

Variations

• Bundt cake version: Bake the batter in a well-greased and cocoa-dusted 10–12 cup bundt pan for 45–50 minutes. Skip the layering and simply glaze with a thinner version of the frosting or a simple chocolate ganache.
• Sheet cake for a crowd: Bake in a greased 9×13-inch (23×33 cm) pan for 35–40 minutes. Frost right in the pan for easy transport and serving.
• Mocha twist: Add 2 tsp instant espresso powder to the cocoa in both the cake and frosting for a chocolate-coffee flavor that pairs beautifully with the stout.

Storage & Make-Ahead

Once frosted, the cake keeps well, covered, at cool room temperature for up to 2 days. If your kitchen is warm, store it in the refrigerator, tightly covered, for up to 5 days; bring slices to room temperature before serving so the crumb softens and the buttercream becomes silky again.

You can bake the cake layers up to 2 days ahead. Wrap fully cooled layers tightly in plastic wrap and store at room temperature, or freeze for up to 2 months (wrap in plastic, then foil). Thaw frozen layers still wrapped at room temperature, then frost. Leftover slices can be frozen individually for up to 2 months; wrap well and thaw at room temperature.

Nutrition (per serving)

Approximate values per slice (1/12 of the cake): about 610 calories, 8 g protein, 74 g carbohydrates, 32 g fat, 19 g saturated fat, 3 g fiber, 51 g sugars, 370 mg sodium. Actual values will vary based on specific ingredients and portion sizes.