This is the dark, fudgy, deeply chocolatey cake made with a full bottle of Guinness — the stout's roastiness amplifies the cocoa flavor without leaving any beer taste. Frosted with a Bailey's Irish cream buttercream that's billowy and pale against the espresso-dark crumb. The St. Patrick's Day showstopper, honestly good year-round.
Fun fact: stout cakes were a way for Irish home bakers to stretch expensive cocoa during World War II — the dark beer added color and depth so you needed less actual chocolate. The original recipes had no chocolate at all, just cocoa and Guinness. The version with melted chocolate folded in (like this one) came later, after rationing ended.
Why this recipe works
- GUINNESS = CHOCOLATE AMPLIFIER. Stout's roasted barley shares flavor compounds with dark chocolate. It tastes like chocolate, not beer. The alcohol bakes off.
- MELT BUTTER INTO BEER. Heating butter into Guinness creates an emulsion that gives the cake a glossy, fudgy crumb — like a brownie-cake hybrid.
- SOUR CREAM TENDERIZES. The acid plus fat keeps the crumb tender and moist for 4+ days. This cake actually gets better on day 2.
Nutrition information
- Calories: 580 kcal per serving
- Protein: 5 g
- Carbohydrates: 76 g
- Sugar: 58 g
- Fat: 28 g
- Saturated Fat: 17 g
Pro tips for the best guinness chocolate cake
- USE DUTCH-PROCESS COCOA. Darker color, smoother flavor, less acidity. Natural cocoa works but the cake will be lighter and slightly more tart.
- ROOM TEMP DAIRY. Cold sour cream + cold eggs = lumpy batter. Pull dairy out 1 hour before baking.
- Bake AHEAD. This cake is actually better on day 2 — flavors meld and crumb tightens. Bake unfrosted, wrap tight, frost day-of.
- Non-alcoholic version: Sub Guinness for strong brewed coffee + 1 tsp baking soda. Sub Bailey's for 1/4 cup heavy cream + 1 tsp Irish cream extract.
Frequently asked questions
Can I taste the beer?
Honestly no. It tastes like deep chocolate. Even non-drinkers don't pick up beer flavor. The alcohol bakes off.
Does Bailey's bake off too?
Bailey's stays raw in the buttercream — there IS alcohol in the frosting. Use the non-alc swap if serving kids or pregnant guests.
Can I make cupcakes?
Yes — fill liners 2/3 full, bake 20-22 minutes. Makes 24 cupcakes. Frost with the same buttercream.
Why is my cake sunken?
Either overmixed batter or you opened the oven before 25 minutes. Both kill rise. Mix gently, peek through the window only.
How long does it keep?
4 days at room temp (covered cake dome). Don't refrigerate — it dries out the crumb. Freeze unfrosted layers up to 3 months, frosting separately.
