Rich, fudgy, and topped with a dreamy swirl of Irish cream buttercream, this Guinness Chocolate Cake with Irish Buttercream is the kind of showstopper you’ll crave long after the last crumbs have disappeared. This is not your basic chocolate cake—Guinness brings a deep, malty note, and the Irish buttercream layers on silky sweetness, making every slice a celebration. Whether you’re making this for St. Patrick’s Day, a birthday, or just a day that deserves a little extra indulgence, get ready to impress.
I love how this cake manages to be both decadent and surprisingly easy. The batter comes together with just a whisk, and while the cake bakes, your kitchen fills with the sweet scent of chocolate and stout. The soft crumb of the cake pairs perfectly with the luscious buttercream and chocolatey ganache drip. This recipe has earned rave reviews for its flavor and unforgettable texture—one taste and you’ll see why.
Why This Cake Is a Must-Bake for Chocolate Lovers
There’s something magical about the combination of Guinness, cocoa, and Irish cream that sets this cake apart. Unlike most chocolate cakes, this one is ultra-moist thanks to the combination of oil and sour cream (or yogurt), with a fullness of flavor from the beer. Guinness gives the chocolate a boost—it doesn’t taste like beer, but you’ll notice a deeper, more complex richness in every bite.
What really takes this over the top is the Irish buttercream. Every forkful gives you smooth, fluffy sweetness with the hint of Bailey’s (or your favorite Irish cream) shining through. The glossy ganache drip adds a final flourish—slice it, and you get beautiful cross-sections of fudgy cake, creamy filling, and chocolatey topping. If you want a cake that feels special but doesn’t require complicated techniques, this one’s for you.
Tools For Baking and Decorating Guinness Chocolate Cake
To set yourself up for bakery-level results, gather these tools before baking:
- 8-inch cake pans – You’ll need two, at least 3 inches deep, for those tall, impressive layers.
- Parchment paper rounds – Makes removing the cakes from the pans a breeze.
- Large mixing bowls – One for dry ingredients, another for wet.
- Whisk and spatula – For smooth batters and gentle folding.
- Electric mixer or hand mixer – Essential for getting that buttercream perfectly fluffy.
- Offset spatula – Spreads frosting evenly and helps with crumb-coating and finishing.
- Wire cooling rack – Ensures your cakes cool quickly and evenly.
- Squeeze bottle (optional) – For precise chocolate drip decoration down the cake sides.
- Cake stand or serving plate – For assembly and that dramatic presentation.
- Heatproof bowl and small pan – For melting chocolate and making ganache.
What Goes Into This Guinness Chocolate Cake with Irish Buttercream
The ingredient list delivers big on chocolate flavor with just the right Irish twist. Here’s a friendly guide to each element:
- flour – Provides structure; all-purpose works best for a soft but sturdy crumb.
- Granulated sugar – Sweetens and helps keep the cake moist and tender.
- Unsweetened cocoa powder – The soul of the chocolate flavor; choose high-quality unsweetened for best results.
- Baking soda and baking powder – Help the cake rise to fluffy perfection.
- Fine sea salt – Enhances the flavors and keeps the cake from tasting flat.
- Sour cream or plain full-fat yogurt – Adds moisture and a lovely subtle tang that supports the chocolatey richness.
- Fresh vegetable oil – Makes the crumb extra moist and soft.
- Large eggs – Bind everything and give the cake its classic tender structure.
- Vanilla extract – Provides a classic cozy note that balances the deep chocolate and stout.
- Guinness beer – Delivers depth, extra moistness, and a unique malty edge.
- Unsalted butter – The backbone of the buttercream; using it at cool room temperature ensures smooth, fluffy icing.
- Powdered sugar (sifted) – Key for that silky, sweet buttercream texture.
- Irish cream (like Bailey’s) – Infuses the frosting with creamy, gently boozy Irish flavor.
- Semisweet or bittersweet chocolate (finely chopped) – For the glossy ganache drip topping.
- Heavy cream – Blends with chocolate to make a rich, pourable ganache.
- Sprinkles or chocolate curls (optional) – Add a festive or elegant finish, perfect for special occasions.
See the recipe card below for the full list of ingredients and measurements.
Step-By-Step: How to Bake, Assemble, and Decorate
Here’s exactly how to build your Guinness Chocolate Cake with Irish Buttercream from start to finish, based on the trusted method that yields rave reviews every time.
- Preheat and pan prep: Preheat your oven to 175°C. Generously grease two 20-cm (8-inch) wide, 7,5-cm (3-inch) deep cake pans, and line the bottoms with parchment paper rounds for easy removal.
- Mix dry ingredients: In a large mixing bowl, whisk together the flour, granulated sugar, unsweetened cocoa powder, baking soda, baking powder, and salt until everything is evenly distributed.
- Prepare wet ingredients: In a medium bowl, whisk together the sour cream (or yogurt), vegetable oil, eggs, vanilla extract, and Guinness until smooth. Notice the batter’s subtle malty aroma as you blend—this is where the cake’s depth of flavor begins.
- Combine wet and dry: Pour the wet mixture into the dry ingredients. Stir gently with a spatula until just combined—take care not to overmix, or your cake will lose its tender, fudgy crumb.
- Bake the cakes: Divide the batter evenly between the prepared pans. Bake for 35 to 40 minutes, or until a tester or skewer comes out clean and the cakes feel springy and smell richly chocolatey. Cool the cakes in the pans for 30 minutes before carefully turning them out onto a wire rack to finish cooling completely. If you have freezer space, pop the cooled cakes in for a bit—it makes assembling and frosting easier.
- Make the buttercream: In a large bowl, beat unsalted butter with an electric or hand mixer until light and fluffy. Slowly add sifted powdered sugar, then pour in Irish cream. Beat on high for about 3 minutes, until the frosting is pale, ultra-fluffy, and smooth. Adjust with extra Irish cream or powdered sugar to reach your favorite consistency—smooth, spreadable, and lush.
- Assemble the cake: Place one cake layer, flat side down, on your cake stand or plate. Generously frost the top, spreading evenly to the edges. Set the second cake layer on top, flat side up for a sleek finish.
- Crumb coat and chill: Using an offset spatula, spread a thin layer of buttercream all over the cake to trap crumbs and create a smooth surface. Chill the cake in the fridge or freezer until the frosting is set and the cake feels firm to the touch.
- Finish frosting: Spread the remaining buttercream all over, or just on top if you prefer a trendy “naked” look, letting those dark chocolatey sides peek through. Chill again while you make the chocolate drip.
- Make the ganache drip: Place finely chopped chocolate in a heatproof bowl. Heat heavy cream in a small pan until just simmering, then pour it over the chocolate. Let it sit covered for a few minutes, then stir until glossy and smooth. Cool until thickened but still pourable—about 10 minutes. Avoid refrigerating the ganache, as it can set too quickly.
- Decorate with ganache: Pour some ganache over the top of your chilled cake. Use an offset spatula to nudge it to the edges, letting it gently drip down the sides, or use a squeeze bottle for more control. The chocolate should set into a glossy, decadent finish.
- Add finishing touches: Scatter sprinkles, chocolate curls, or festive decorations over the ganache before it sets completely so they stick perfectly.
- Storage: Store your cake covered, at cool room temperature, for 2–3 days. Every slice stays moist and flavorful—even after a couple of days, the cake’s texture is dreamy.
Tips, Troubleshooting, and Common Mistakes With Guinness Cake
Even the most decadent cakes can hit a snag—here’s how to keep your Guinness Chocolate Cake with Irish Buttercream picture-perfect every time.
- Avoid overmixing: Gently fold wet into dry until just combined. Overmixing makes the cake dense, not delightfully moist and airy.
- Check for doneness early: Ovens vary! Begin checking your cakes at the 35-minute mark. The tops should spring back, and a tester should come out clean or with just a few moist crumbs.
- Make your buttercream blissfully smooth: Use sifted powdered sugar and beat your butter well for that cloud-like texture. If it’s too sweet, add a pinch of salt or swap a little butter with cream cheese.
- Perfecting the ganache drip: If the ganache is too thin, let it cool longer. Too thick? Briefly warm it in the microwave in short bursts, stirring between each, so you get that beautiful, slow drip down the cake’s edge.
- Chill before decorating: Cold cake layers are much easier to frost and crumb coat. Don’t skip this step—it makes the final assembly feel so much easier and more professional.
- Sweetness balance: If you like your buttercream less sweet, use a little less powdered sugar or make a cream cheese-based frosting as some reviewers suggested. Adjust to your taste and enjoy the results!
Pairing Ideas and Creative Variations to Try
This cake is a natural star for special events and simple gatherings alike. Here are some ways to dress it up, tone it down, and serve with style:
- Serve with coffee or stout: A rich cup of coffee or glass of Guinness or Irish stout alongside each slice is a total treat.
- Pair with easy sides: Fresh berries, vanilla ice cream, or lightly whipped cream balance the cake’s deep flavors without overpowering them.
- Try a flavored buttercream: Play with the buttercream by using different Irish cream liqueurs, or go for a cream cheese-based option for extra tang.
- Make it a naked cake: For that rustic, modern look (and an excuse to pile even more buttercream between the layers), keep the sides mostly unfrosted.
- Add coconut or nuts: Toasted coconut, slivered almonds, or chopped hazelnuts suit the flavors beautifully. Several reviewers loved experimenting this way.
- Go cupcake-style: Bake the batter as cupcakes—just adjust baking time and enjoy as hand-held treats.
- Decorate for any occasion: Switch up sprinkles, chocolate shavings, or edible gold leaf for birthdays, holidays, or family parties.
- Lighter or richer: Swap sour cream with plain yogurt for a slightly lighter crumb. Prefer extra dark chocolate? Add a touch more cocoa powder for intensity (as one baker did).
FAQs about Guinness Chocolate Cake with Irish Buttercream
Can I make Guinness Chocolate Cake with Irish Buttercream in advance?
Absolutely! You can make the cake layers up to two days ahead—just wrap them well and keep at room temperature or in the fridge. Assemble and frost the day you plan to serve for the freshest texture. Chilling the assembled cake can make slicing even easier.
Does Guinness Chocolate Cake taste like beer, and can I substitute it?
Guinness in this cake deepens the chocolate flavors without leaving a strong beer taste—it’s subtle, rich, and malty. If you need to skip the beer, you can try using a strong brewed coffee for a slightly different but delicious flavor.
How should I store leftover Guinness Chocolate Cake with Irish Buttercream?
Keep your finished cake covered with a cake keeper at a cool, dry room temperature for up to three days. The texture stays rich and moist. If you want to freeze it, freeze unfrosted layers wrapped tightly, then thaw and frost before serving.
The Final Slice: A Cake to Make and Share
Slicing into this Guinness Chocolate Cake with Irish Buttercream is the best kind of celebration—fluffy layers, creamy frosting, and glistening ganache come together for a mouthwatering experience you’ll want to share. You’ll taste malty richness, a gentle boozy edge, and that deep chocolate flavor in every bite. It’s a cake that brings people together, simple enough to make on a cozy weekend, special enough to star at your next gathering. There’s nothing left to do but dig in.
More Delicious Recipes
- St. Patrick’s Day Chocolate Guinness Bundt Cake with Stout Glaze: This recipe also features Guinness, bringing that same rich flavor in a different cake format perfect for celebrations.
- Irish Coffee: Pair your delicious cake with this classic drink that complements the flavors of Irish cream and chocolate beautifully.
- St. Patrick’s Day Truffles: These fun and festive truffles offer a tasty Irish treat that echoes the flavors found in your Guinness chocolate cake.
Guinness Chocolate Cake with Irish Buttercream
Equipment
- 8-inch cake pans
- Parchment paper rounds
- Large mixing bowls
- Whisk and spatula
- Electric mixer or hand mixer
- Offset spatula
- Wire cooling rack
- Squeeze bottle (optional)
- Cake stand or serving plate
- Heatproof bowl and small pan
Ingredients
Ingredients
- 1 3/4 cups all-purpose flour
- 2 cups granulated sugar
- 3/4 cup unsweetened cocoa powder
- 2 teaspoons baking soda
- 1/2 teaspoon baking powder
- 1 teaspoon fine sea salt
- 3/4 cup sour cream or plain full-fat yogurt (at room temperature)
- 1/2 cup fresh vegetable oil
- 1 teaspoon vanilla extract
- 1 cup Guinness beer
- 4 sticks unsalted butter (at cool room temperature)
- 6 cups powdered sugar (sifted)
- 1/4 cup plus 2 tablespoons Irish cream (such as Bailey’s)
- 4 ounces semisweet or bittersweet chocolate (finely chopped)
- 1/2 cup heavy cream
- sprinkles or chocolate curls for topping (optional)
Instructions
Instructions
- Preheat the oven to 350°F. Generously grease two 8-inch wide x 3-inch deep cake pans and line with parchment paper rounds.
- In a large mixing bowl, whisk together the flour, sugar, cocoa, baking soda, baking powder, and salt.
- In a medium bowl, whisk together the sour cream, vegetable oil, eggs, vanilla, and beer.
- Add the wet ingredients into the dry ingredients and stir with a spatula until just combined, being careful not to overmix.
- Divide the batter between the prepared pans and bake for 35 to 40 minutes, or until a cake tester comes out clean. Cool the cakes in their pans for 30 minutes before carefully turning them out onto a cooling rack or wire rack to cool completely. If possible, freeze the cakes while you prepare the buttercream.
- In a large bowl, use an electric mixer or hand mixer to beat the butter until light and fluffy. Gradually add the sifted powdered sugar, then the Irish cream. Beat the mixture on high speed until very light, fluffy, and smooth, about 3 minutes. If the frosting is too thick, add a splash more Irish cream. If it’s too thin, add more powdered sugar.
- Place one cake layer on a cake stand or serving plate. Frost the top of the cake generously, as this will become the filling. Use even more if you're decorating as a 'naked' cake as shown in the photos. Top with the other cake layer, flat side up.
- With an offset spatula, spread a very thin layer of frosting all over the cake. This layer is a crumb coat and should act like spackle. For the smoothest frosting, return the cake to the fridge or freezer until firm to the touch.
- Spread the remaining frosting all over the cake. If desired, focus the frosting on the top to maintain the 'naked' look. Refrigerate while you prepare chocolate drip.
- Place the chopped chocolate in a heatproof bowl. In a small pan, bring the heavy cream to a simmer then immediately remove from heat and pour over chocolate. You can also do this in the microwave. Cover for a few minutes then stir until smooth.
- Allow to cool until it has thickened but is still pourable, about 10 minutes. Don’t place ganache in the fridge to cool. Test the consistency of the drip by pouring down the side of a glass. If it’s too thick, microwave for 5 to 10 seconds. If it’s too thin, continue to cool.
- Carefully pour some of the ganache over the top of the chilled cake. Use an offset spatula to quickly smooth the ganache over the top of the cake before it sets, spreading evenly just to the cake’s edge. Use a squeeze bottle to gently squeeze one drip at a time down the sides of the cake.
- Before the ganache fully sets, add sprinkles, chocolate curls, or any other decor you like. It won’t adhere properly if you allow the ganache to firm up before adding.
- This cake can be stored, covered with a cake keeper, at a cool, dry room temperature for 2-3 days.*
