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Guinness Brownies with Guinness Frosting

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Rich, fudgy brownies infused with Guinness stout and topped with a silky Guinness frosting.

  • Author: daniel-kim
  • Prep Time: 35 minutes
  • Cook Time: 35 minutes
  • Total Time: 70 minutes
  • Yield: 16 servings 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

Scale
  • 1 (11.2–12-ounce) bottle Guinness Draught Stout beer
  • 3/4 cup unsalted butter
  • 2 (4-ounce) bars semi-sweet chocolate, coarsely chopped
  • 1 and 1/4 cups granulated sugar
  • 3 large eggs
  • 1 teaspoon pure vanilla extract
  • 1 cup all-purpose flour
  • 1/2 teaspoon salt
  • 1/2 teaspoon espresso powder (optional)
  • Guinness Frosting:
  • 1/2 cup unsalted butter, softened
  • 2 cups confectioners’ sugar
  • 2–3 tablespoons reduced Guinness
  • 1 teaspoon espresso powder
  • 1/2 teaspoon pure vanilla extract
  • 1/4 teaspoon salt

Instructions

  1. Reduce the Guinness by boiling it in a saucepan until it measures 2/3 cup, about 12-15 minutes. Allow to cool for 10 minutes.
  2. Prepare the oven and pan by preheating to 350°F (175°C) and greasing a 9-inch square baking pan.
  3. Melt the butter and chopped chocolate in a large bowl in the microwave.
  4. Combine sugar and 1/2 cup of the reduced Guinness, whisk until glossy.
  5. Add the eggs and vanilla, whisk until fully incorporated.
  6. Add the flour, salt, and optional espresso powder, whisk until just combined.
  7. Bake for 32-35 minutes until a toothpick comes out with a few moist crumbs.
  8. Cool the brownies completely in the pan before frosting.
  9. Make the frosting by beating softened butter until smooth, then gradually add confectioners’ sugar and mix well.
  10. Finish the frosting with the reduced Guinness, espresso powder, vanilla extract, and salt; adjust consistency as needed.
  11. Frost the cooled brownies and cut into squares before serving.

Notes

Store frosted brownies at room temperature for up to 3 days. Unfrosted brownies can be frozen for up to 3 months.

Nutrition

Find it online: https://daytasty.com/guinness-brownies-with-guinness-frosting/