Name: Chocolate Guinness Cake with Irish Buttercream Frosting Recipe
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: Irish
Ingredients: 1 cup Guinness beer, room temperature; 1 cup unsalted butter, cut into pieces; 3/4 cup cocoa powder; 2 cups granulated sugar; 3/4 cup sour cream, room temperature; 2 large eggs, room temperature; 1 tablespoon pure vanilla extract; 2 cups all-purpose flour; 2 1/2 teaspoons baking soda; 1/2 teaspoon kosher salt; 1 cup unsalted butter, softened; 4 cups powdered sugar, sifted; 2 to 4 tablespoons Irish cream liqueur (such as Baileys); 1 teaspoon pure vanilla extract; Caramel sauce; Chocolate shavings; Sprinkles

Print Recipe·4 from 14 reviews

There is something utterly magical about a rich, moist Chocolate Guinness Cake paired with a luxuriously smooth Irish Buttercream Frosting, making it an unforgettable treat for any occasion. This Chocolate Guinness Cake with Irish Buttercream Frosting Recipe perfectly balances the deep, malty flavors of Guinness beer with the indulgent sweetness of chocolate and the creamy, boozy hint of Irish cream in the frosting. Each bite feels like a cozy celebration, whether you’re sharing it at a family gathering or treating yourself to a decadent slice with your afternoon coffee.

Ingredients You’ll Need

The image shows a white marbled surface with several clear and white bowls arranged in a grid. There is a large white bowl at the top left filled with white flour, next to a clear bowl with light brown liquid, and another white bowl with white granulated sugar. Below, there is a clear bowl with cocoa powder, a small glass container with light yellow cubed butter, and a clear bowl with white creamy yogurt. Two brown eggs lay side by side on the surface. Small glass bowls with white powder, dark vanilla liquid, and granulated white sugar are also placed neatly. The overall scene is clean and organized with ingredients ready for baking. Photo taken with an iphone --ar 4:5 --v 7

Every ingredient in this recipe plays an essential role in creating the perfect balance of flavor, texture, and appearance. From the robust Guinness to the silky buttercream, these simple staples come together to create something truly special.

1 cup Guinness beer, room temperature: Adds deep, malty richness and moistness to the cake’s crumb.
1 cup unsalted butter, cut into pieces: Infuses the batter with creaminess and richness as it melts into the stout.
3/4 cup cocoa powder: Contributes complex chocolate flavor and enhances the cake’s deep color.
2 cups granulated sugar: Sweetens the cake while helping with its tender texture.
3/4 cup sour cream, room temperature: Adds moisture and a slight tanginess for balanced flavor.
2 large eggs, room temperature: Bind the ingredients together and provide structure.
1 tablespoon pure vanilla extract: Elevates the chocolate and buttercream flavors subtly.
2 cups all-purpose flour: The foundation of the cake’s structure.
2 1/2 teaspoons baking soda: Helps the cake rise for a light, airy texture.
1/2 teaspoon kosher salt: Enhances all the flavors, balancing sweetness and bitterness.
1 cup unsalted butter, softened: The key base for the Irish buttercream, making it smooth and creamy.
4 cups powdered sugar, sifted: Sweetens and thickens the frosting perfectly.
2 to 4 tablespoons Irish cream liqueur (such as Baileys): Imparts that signature Irish charm and boozy warmth to the frosting.
1 teaspoon pure vanilla extract: Adds a lovely aromatic note to the frosting.
Caramel sauce (optional): For drizzling and enhancing the cake’s decadence.
Chocolate shavings (optional): For an elegant finishing touch.
Sprinkles (optional): Adds fun texture and a pop of color.

How to Make Chocolate Guinness Cake with Irish Buttercream Frosting Recipe

Step 1: Prepare the Oven and Pan

Preheat your oven to 350°F and grease a 9×9-inch pan or line it with parchment paper. This ensures an easy release later and even baking, which is crucial for that perfect cake texture.

Step 2: Heat the Guinness and Butter

In a medium saucepan over medium heat, melt together the 1 cup of Guinness beer and the 1 cup of unsalted butter cut into pieces. Stir until the butter is fully melted. This step melds the flavors and prepares the stout to absorb the cocoa powder beautifully.

Step 3: Add Cocoa Powder

Whisk in the 3/4 cup cocoa powder until the mixture is smooth and evenly combined. Then remove the pan from heat and let the mixture cool slightly to avoid cooking the eggs later.

Step 4: Mix the Dry Ingredients

In a large bowl, whisk together the all-purpose flour, granulated sugar, baking soda, and kosher salt. This dry blend sets the stage for the perfect crumb structure and balanced sweetness.

Step 5: Mix the Wet Ingredients

In a separate bowl, whisk together the sour cream, eggs, and vanilla extract until smooth. This combination brings moisture, richness, and depth to the cake.

Step 6: Combine Everything

Slowly add the Guinness and cocoa mixture into the wet ingredients, whisking gently. Then add this wet mixture to the dry ingredients and stir until just combined and smooth. Be careful not to overmix – this keeps the cake tender.

Step 7: Bake the Cake

Pour the batter evenly into your prepared pan and bake it for 35 to 40 minutes. Use a toothpick inserted into the center to check doneness — it should come out clean or with a few moist crumbs.

Step 8: Cool Completely

Once baked, set the cake aside to cool completely in the pan. This is important before frosting to avoid melting the buttercream, which gives you the perfect spreadable consistency.

Step 9: Make the Irish Buttercream Frosting

Using a large bowl, beat the softened butter until creamy and smooth. Gradually add the sifted powdered sugar on low speed to prevent sugar clouds, then increase the speed to mix fully.

Step 10: Flavor the Frosting

Add Irish cream liqueur and vanilla extract to the butter-sugar mix. Beat until light and fluffy, adding more Irish cream by the tablespoon if needed to reach your preferred consistency and flavor balance. This frosting is the ultimate nod to the Irish spirit in this recipe.

Step 11: Frost the Cake

Spread the Irish buttercream frosting generously over the cooled cake. The contrast of the rich cake with soft frosting creates the ultimate indulgence.

Step 12: Optional Toppings and Serve

Finish with optional drizzles of caramel sauce, chocolate shavings, or colorful sprinkles to add a personal and festive touch. Slice and serve to delighted guests!

How to Serve Chocolate Guinness Cake with Irish Buttercream Frosting Recipe

A square dark brown brownie bar is shown from above, topped with a thick, smooth layer of pale cream-colored frosting spread evenly across the entire surface. The brownie base is dense with slightly crumbly edges visible beneath the frosting. The dessert rests on white parchment paper placed on a white marbled surface. A small corner of a white bowl is visible at the edge. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Garnishing your Chocolate Guinness Cake with Irish Buttercream Frosting Recipe can be a delightful way to amp up the presentation and deepen flavors. I love adding chocolate shavings for a rustic touch, a drizzle of warm caramel sauce for extra sweetness, or even a scattering of festive sprinkles. These simple additions transform the cake from everyday to exceptional.

Side Dishes

This cake pairs wonderfully with whipped cream or a scoop of vanilla bean ice cream to cool down its rich, boozy notes. For an adult twist, a small glass of Irish cream liqueur on the side complements the cake flavors perfectly.

Creative Ways to Present

Serve the cake on a rustic wooden board with fresh berries for a pop of color and freshness. Alternatively, cut it into petite squares for a party platter or layer it in a trifle dish with whipped cream for an eye-catching dessert centerpiece. The versatility of this Chocolate Guinness Cake with Irish Buttercream Frosting Recipe means you can tailor it to any occasion easily.

Make Ahead and Storage

Storing Leftovers

After enjoying your cake, wrap any leftovers tightly in plastic wrap or store in an airtight container in the refrigerator. It will stay moist and flavorful for up to four days, making it perfect for savoring over multiple indulgent moments.

Freezing

You can freeze the unfrosted cake for up to three months. Wrap it well with plastic wrap and then foil to prevent freezer burn. Thaw in the refrigerator overnight before frosting and serving. If you want to freeze the frosted cake, flash freeze it uncovered, then wrap carefully—this preserves the frosting texture better.

Reheating

To warm leftover slices, gently microwave at 15-second intervals until just warm — this brings back the cake’s soft richness without drying it out. Pair with a little extra frosting or cream for a quick refresh.

FAQs

Can I use a different stout instead of Guinness?

Absolutely! While Guinness is classic for its rich, malty profile, other stouts with similar flavor intensity will work well and create slight variations, so feel free to experiment.

Is the Irish cream liqueur necessary in the frosting?

The liqueur adds signature flavor and slight boozy notes that elevate the frosting. You can omit it for a non-alcoholic version, substituting with milk or cream and a touch more vanilla extract.

What if I don’t have sour cream?

You can substitute sour cream with Greek yogurt or buttermilk to maintain the moisture and slight tanginess crucial for this cake’s balance.

Can I make this recipe gluten-free?

Yes! Substitute a gluten-free all-purpose flour blend that includes xanthan gum to replicate the texture and structure of the original cake.

How long does this cake stay fresh at room temperature?

Since the cake contains dairy-based frosting, it’s best stored refrigerated and eaten within four days. At room temperature, it’s safe for only a couple of hours.

Final Thoughts

This Chocolate Guinness Cake with Irish Buttercream Frosting Recipe is a celebration of flavors and textures that feels both indulgent and inviting. From the tender, subtly boozy crumb to the creamy, dreamy frosting, every slice tells a story of comfort and joy. I can’t wait for you to try it and make it a beloved dessert in your own kitchen. Once you do, this cake is bound to become your go-to for celebrations or those quiet moments when you deserve a little luxury.