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Decadent Guinness Chocolate Cake Recipe with Easy Baileys Buttercream Frosting

Guinness chocolate cake - featured image
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A rich, moist chocolate cake infused with Guinness stout and topped with a silky Baileys Irish Cream buttercream frosting. Perfect for celebrations or an indulgent treat.

Ingredients

Scale
  • 1 cup (8 fl oz) Guinness stout
  • 3/4 cup (75 g) unsweetened cocoa powder (preferably Dutch-processed)
  • 2 cups (8.8 oz) all-purpose flour, sifted
  • 2 cups (14 oz) granulated sugar
  • 1 1/2 tsp baking soda
  • 3/4 tsp salt
  • 3/4 cup (6 fl oz) buttermilk, room temperature
  • 1/2 cup (4 oz) unsalted butter, melted
  • 2 large eggs, room temperature
  • 2 tsp vanilla extract
  • For the Baileys Buttercream Frosting:
  • 1 cup (8 oz) unsalted butter, softened
  • 3 1/2 cups (14 oz) powdered sugar, sifted
  • 1/4 cup (2 fl oz) Baileys Irish Cream
  • 1 tsp vanilla extract
  • Pinch of salt

Instructions

  1. Preheat oven to 350°F (175°C). Grease and flour two 9-inch round cake pans or line with parchment paper.
  2. In a small saucepan, simmer 1 cup Guinness and 3/4 cup cocoa powder over medium heat, whisking constantly until smooth, about 2-3 minutes. Remove from heat and cool slightly.
  3. In a large bowl, sift together flour, sugar, baking soda, and salt. Whisk to combine.
  4. In another bowl, whisk together buttermilk, melted butter, eggs, and vanilla extract until smooth.
  5. Pour the cooled Guinness-cocoa mixture into the wet ingredients and whisk to combine.
  6. Gradually fold the dry ingredients into the wet mixture with a rubber spatula until just combined; avoid overmixing.
  7. Divide batter evenly between prepared pans and smooth tops.
  8. Bake for 45-50 minutes or until a toothpick inserted in the center comes out clean. Begin checking at 40 minutes.
  9. Cool cakes in pans for 15 minutes, then transfer to a cooling rack to cool completely.
  10. For the frosting, beat softened butter on medium speed until creamy, about 2 minutes.
  11. Gradually add powdered sugar on low speed until combined.
  12. Add Baileys Irish Cream, vanilla extract, and salt; beat on high for 3-4 minutes until light and fluffy.
  13. If frosting is too soft, chill for 15 minutes before using.
  14. Assemble cake by placing one layer on a plate, spreading frosting on top, then adding the second layer and frosting the top and sides evenly.
  15. Optional: garnish with shaved dark chocolate or cocoa nibs.

Notes

Simmering Guinness with cocoa powder intensifies flavor. Avoid overmixing batter to keep cake tender. Use softened butter for frosting to achieve fluffiness. Chill frosting if too soft. Let cakes cool completely before frosting to prevent melting.

Nutrition

Keywords: Guinness chocolate cake, Baileys buttercream, Irish dessert, chocolate cake recipe, stout cake, easy chocolate cake, celebration cake

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