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A stack of three Guinness brownies.

Guinness Chocolate Brownies

  • Author: Lindsay
  • Prep Time: 15 minutes
  • Cook Time: 30 minutes
  • Total Time: 45 minutes
  • Yield: 12-15 Brownies
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


These Guinness Chocolate Brownies are the moistest brownies ever, and they’re an awesome combination of cakey and fudgy. You won’t be able to stop eating them!


Guinness Brownies

  • 1/4 cup (60ml) vegetable oil
  • 3/4 cup Guinness Stout beer
  • 2 cups (414g) sugar
  • ½ tsp espresso powder, optional
  • 1/2 tsp vanilla extract
  • ¼ tsp salt
  • 1/4 cup (56g) unsalted butter, melted
  • 2 large eggs
  • 1 cup (130g) all-purpose flour
  • 2/3 cup (76g) Dutch-processed cocoa powder

Chocolate Topping

  • 5 oz (2/3 cup) semi-sweet chocolate chips
  • 2 tbsp unsalted butter
  • 2 tbsp Guinness Stout beer
  • 1/4 cup (29g) powdered sugar


  1. Preheat oven to 350°F (180°C). Grease a 9×9 square baking pan and line it with parchment paper that sticks up over the sides. You can use the parchment paper later to help remove the brownies from the pan.
  2. Add the oil, Guinness, sugar, espresso powder, vanilla extract and salt to large mixing bowl and whisk together until well combined.
  3. Add the melted butter and whisk together until well combined.
  4. Add the eggs and whisk together until well combined.
  5. Add the flour and cocoa powder and whisk together gently just until well combined.
  6. Pour the batter into the prepared pan and spread evenly.
  7. Bake for 30-35 minutes, or until a toothpick comes out with a few moist, sticky crumbs. Allow to cool in the pan.
  8. To make the chocolate topping, place the chocolate chips, butter and Guinness in a microwave safe bowl and microwave until the Guinness gets hot and butter starts to melt, about 30 seconds or so. Whisk together until smooth. You can microwave it for a little longer, if needed.
  9. Add the powdered sugar and whisk until well combined and smooth.
  10. Pour the ganache over the brownies and spread into an even layer.
  11. Allow to cool completely, then use the parchment paper to remove them from the pan. Cut into bars.
  12. Store brownies in an airtight container. They can be stored at room temperature for up to 2 days, then should be refrigerated because of the topping. Best if eaten within 4-5 days.


  • Serving Size: 1 Brownie
  • Calories: 387
  • Sugar: 45.7 g
  • Sodium: 73.7 mg
  • Fat: 18.7 g
  • Carbohydrates: 53.7 g
  • Protein: 4.5 g
  • Cholesterol: 43 mg