Guinness Chocolate Cake with Irish Buttercream

Introduction

This Guinness Chocolate Cake is a rich, moist chocolate cake made with Guinness beer and finished with smooth Irish buttercream. The Guinness adds depth to the chocolate flavor while keeping the cake wonderfully tender.

A silky chocolate drip and optional sprinkles or chocolate curls finish the cake beautifully. It’s a great choice for birthdays, St. Patrick’s Day celebrations, or whenever you want a chocolate dessert with a little Irish-inspired twist.

Quick Recipe Overview

• Prep Time: 30 minutes
• Bake Time: 30–35 minutes
• Total Time: About 1 hour 30 minutes
• Servings: 10–12
• Course: Dessert
• Cuisine: Irish-inspired
• Main Keyword: Guinness Chocolate Cake

Ingredients

For the Guinness Chocolate Cake

• 1 ¾ cups (222 g) all-purpose flour
• 2 cups (400 g) granulated sugar
• ¾ cup (64 g) unsweetened cocoa powder
• 2 teaspoons baking soda
• ½ teaspoon baking powder
• 1 teaspoon fine sea salt
• ¾ cup (170 g) sour cream or plain full-fat yogurt, room temperature
• ½ cup vegetable oil
• 3 large eggs, room temperature
• 1 teaspoon vanilla extract
• 1 cup Guinness beer

For the Irish Buttercream

• 4 sticks (454 g) unsalted butter, cool room temperature
• 6 cups (750 g) powdered sugar, sifted
• ¼ cup plus 2 tablespoons Irish cream

For the Chocolate Drip

• 4 ounces (113 g) semisweet or bittersweet chocolate, finely chopped
• ½ cup heavy cream
• Sprinkles or chocolate curls, optional

Step-by-Step Instructions

1. Prepare the Cake Pans

Preheat your oven to 350°F (175°C). Grease and line two 8-inch round cake pans with parchment paper.

2. Mix the Dry Ingredients

In a large bowl, whisk together the flour, granulated sugar, cocoa powder, baking soda, baking powder, and salt until evenly combined.

3. Add the Wet Ingredients

Add the sour cream or yogurt, vegetable oil, eggs, and vanilla extract. Mix until the batter is smooth and there are no large streaks of dry ingredients.

4. Add the Guinness

Slowly pour in the Guinness while mixing gently. The batter will become fairly thin, which is normal for this cake.

Avoid overmixing once the batter is combined.

5. Bake the Cakes

Divide the batter evenly between the prepared cake pans.

Bake for about 30–35 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

Let the cakes cool in their pans for about 10 minutes, then transfer them to a wire rack to cool completely.

6. Make the Irish Buttercream

Beat the room-temperature butter until smooth and creamy.

Gradually add the sifted powdered sugar, mixing on low speed at first to prevent the sugar from flying out of the bowl.

Once incorporated, increase the speed and beat until light and fluffy.

Add the Irish cream and continue beating until the buttercream is smooth and spreadable.

7. Make the Chocolate Drip

Place the chopped chocolate in a heatproof bowl.

Heat the heavy cream until steaming but not boiling. Pour it over the chocolate and let it sit for about 2 minutes.

Stir gently until completely smooth. Let the ganache cool until it thickens slightly but is still easy to pour.

8. Assemble the Cake

Place one completely cooled cake layer on a serving plate.

Spread a layer of Irish buttercream over the top. Place the second cake layer on top.

Cover the entire cake with a thin crumb coat of buttercream and chill briefly if needed.

Add the remaining buttercream and smooth the sides and top.

9. Add the Chocolate Drip

Spoon or pipe the slightly cooled chocolate ganache around the edge of the cake, allowing some of it to drip naturally down the sides.

Spread the remaining ganache over the top if desired.

Finish with sprinkles or chocolate curls.

Allow the cake to set before slicing.

Recipe Tips for Success

• Use room-temperature ingredients: Room-temperature eggs and sour cream help the batter mix evenly.
• Measure flour correctly: Too much flour can make the cake dense and dry.
• Don’t overmix: Mix just until the ingredients are combined.
• Cool the cake completely: Warm cake layers can melt the buttercream.
• Use cool room-temperature butter: This gives the buttercream a smooth texture without making it greasy or too soft.
• Let the ganache cool slightly: If it’s too hot, it can melt the buttercream.
• Chill between decorating steps: A short chill makes the cake much easier to frost neatly.

Ingredient Substitutions

Sour Cream

Plain full-fat yogurt can be used instead of sour cream.

Vegetable Oil

A neutral oil such as canola or sunflower oil can be used.

Irish Cream

Irish cream gives the buttercream its signature flavor. If you don’t want to use it, you can replace it with a small amount of milk or heavy cream plus vanilla, although the flavor will be different.

Chocolate

Use semisweet or bittersweet chocolate depending on how rich and intense you want the chocolate drip to taste.

Recipe Variations

Guinness Chocolate Cupcakes

Divide the batter among lined muffin cups and reduce the baking time. Check them early with a toothpick.

Extra Chocolate Cake

Add a thin layer of chocolate ganache between the cake layers along with the Irish buttercream.

Chocolate Shavings

Instead of sprinkles, decorate the top with dark chocolate curls or finely shaved chocolate.

Simple Guinness Cake

Skip the chocolate drip and finish the cake with a generous layer of Irish buttercream.

Storage and Reheating

Store the finished cake covered in the refrigerator for up to 4 days.

For the best texture, let individual slices sit at room temperature for about 20–30 minutes before serving.

The unfrosted cake layers can also be wrapped tightly and frozen for up to 2–3 months. Thaw them completely before decorating.

Serving Suggestions

Serve slices with:

• Fresh berries
• A dusting of cocoa powder
• Chocolate curls
• Extra Irish cream buttercream
• A cup of coffee
• Black tea
• Vanilla ice cream

For celebrations, colorful sprinkles make the cake especially festive.

Nutrition Information

Estimated per serving, based on 12 servings:

• Calories: 720 kcal
• Protein: 7 g
• Carbohydrates: 91 g
• Fat: 38 g
• Saturated Fat: 22 g
• Fiber: 3 g
• Sugar: 69 g
• Sodium: 430 mg

Nutrition values are estimates and can vary depending on the specific ingredients and portion sizes used.

Frequently Asked Questions

Does Guinness make the cake taste like beer?

Not strongly. Guinness adds a deep, slightly roasted flavor that complements the chocolate. The finished cake tastes primarily like a rich chocolate cake.

Can I use plain yogurt instead of sour cream?

Yes. Full-fat plain yogurt works well as a substitute for sour cream and helps keep the cake moist.

Can I make this cake ahead of time?

Yes. You can bake the cake layers a day ahead and keep them tightly wrapped until you’re ready to assemble and decorate the cake.

Why is my chocolate cake batter thin?

The Guinness and other wet ingredients create a thinner batter than many traditional cake recipes. This is normal and helps produce a moist cake.

How do I prevent the chocolate drip from melting the frosting?

Make sure the ganache has cooled and thickened slightly before adding it to the cake. It should be pourable but not hot.

Can I freeze Guinness chocolate cake?

Yes. The unfrosted cake layers freeze well when tightly wrapped. Thaw them completely before frosting and decorating.

Does this recipe contain alcohol?

Yes. Guinness beer is used in the cake and Irish cream is used in the buttercream. These ingredients should be considered when serving the cake to children, people avoiding alcohol, or anyone with dietary restrictions.

Final Thoughts

This Guinness Chocolate Cake brings together rich chocolate, the deep flavor of Guinness, creamy Irish buttercream, and a smooth chocolate drip. The cake is soft and moist, while the buttercream adds a sweet, creamy contrast.

It’s an impressive homemade dessert for celebrations, holidays, or any occasion when you want a chocolate cake with something a little different.

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