Guinness Brownies with Guinness Frosting

These Guinness brownies are rich, fudgy, and perfectly boozy in the best way. Dark chocolate and butter create a dense, glossy brownie base with a subtle malty lift from reduced Guinness. The frosting echoes that stout flavor, lightening the texture while keeping a pronounced cocoa and coffee note from a pinch of espresso powder. Expect a slightly crisp top, a chewy, moist center, and a silky, spreadable frosting that mellows the beer’s bitterness. Aromas of roasted malt, chocolate, and a hint of coffee make these ideal for chilly evenings, holiday gatherings, or any time you want a decadent dessert with grown-up depth. Serve them with coffee, a glass of milk, or another pour of Guinness for a themed treat. These brownies travel well to potlucks and are a fun way to use stout in baking without overpowering the chocolate.

Ingredients

• 1 (11.2–12-ounce) bottle Guinness Draught Stout beer
  Used to infuse the brownies with roast and malt notes. You will reduce this to concentrate flavor.

• 3/4 cup unsalted butter
  Adds richness and tender crumb to the brownie batter.

• 2 (4-ounce) bars semi-sweet chocolate, coarsely chopped
  Melts into the batter for deep chocolate flavor and a fudgy texture.

• 1 and 1/4 cups granulated sugar
  Sweetens and helps create the glossy brownie surface.

• 3 large eggs, at room temperature
  Provide structure and a chewy, tender texture.

• 1 teaspoon pure vanilla extract
  Enhances the chocolate and stout flavors.

• 1 cup all-purpose flour
  Gives structure to the brownies while keeping them dense and fudgy.

• 1/2 teaspoon salt
  Balances sweetness and amplifies chocolate flavor.

• 1/2 teaspoon espresso powder (optional)
  Intensifies chocolate notes with a mild coffee boost, optional but recommended.

Frosting

• 1/2 cup unsalted butter, softened to room temperature (for frosting)
  Creates a creamy base for the frosting.

• 2 cups confectioners’ sugar (for frosting)
  Sweetens and thickens the frosting to a spreadable consistency.

• 2–3 tablespoons reduced Guinness (for frosting)
  Adds a concentrated stout flavor to the frosting; start with 2 tablespoons and add more if needed.

• 1 teaspoon espresso powder (for frosting)
  Brings depth and supports the chocolate and stout flavors in the frosting.

• 1/2 teaspoon pure vanilla extract (for frosting)
  Rounds out the frosting flavor.

• 1/4 teaspoon salt (for frosting)
  Balances the sweetness in the frosting.

Step-by-step Instructions

1. Reduce the Guinness
   Pour the bottle of Guinness into a small saucepan and bring to a boil over medium-high heat. Reduce the heat and simmer until it has reduced to 2/3 cup, about 12 to 15 minutes. Remove from heat and let it cool for at least 10 minutes before using. Tip: Watch closely near the end to prevent scorching.

2. Prepare the pan and oven
   Preheat the oven to 350°F (175°C). Grease a 9-inch square baking pan to prevent sticking.

3. Melt butter and chocolate
   Place the 3/4 cup unsalted butter and coarsely chopped semi-sweet chocolate in a heatproof bowl. Microwave in 30-second increments, whisking between each, until fully melted and smooth.

4. Combine sugar and Guinness
   Whisk the granulated sugar into the melted chocolate mixture. Add 1/2 cup of the reduced Guinness and whisk until the batter becomes glossy.

5. Add eggs and vanilla
   Add the eggs, one at a time, whisking after each until smoothly blended. Stir in the 1 teaspoon pure vanilla extract.

6. Add dry ingredients
   Add the 1 cup all-purpose flour, 1/2 teaspoon salt, and 1/2 teaspoon espresso powder if using. Whisk gently until just combined without overmixing.

7. Bake brownies
   Pour the batter into the prepared 9-inch square pan and smooth the top. Bake at 350°F (175°C) for 32 to 35 minutes. Test doneness with a toothpick inserted near the center. A few moist crumbs are ideal for fudgy brownies.

8. Cool completely
   Allow the brownies to cool completely in the pan before frosting. Cooling fully ensures the frosting spreads smoothly and sets properly.

9. Make frosting
   In a mixing bowl, beat the 1/2 cup softened unsalted butter until smooth. Gradually mix in the 2 cups confectioners’ sugar until combined and fluffy.

10. Finish frosting
    Add 2 tablespoons of the reduced Guinness, 1 teaspoon espresso powder, 1/2 teaspoon pure vanilla extract, and 1/4 teaspoon salt to the frosting. Beat until smooth. If frosting is too stiff, add the third tablespoon of reduced Guinness a little at a time to reach desired consistency.

11. Frost and serve
    Spread the frosting over the cooled brownies. Cut into squares and serve. Store leftovers at room temperature in an airtight container.

Recipe Details

• Prep Time: 25 minutes
• Cook Time: 35 minutes
• Total Time: 1 hour
• Servings: 16 brownies
• Calories: Approximately 370 per serving

Tips, Storage & Variations

Tips

• Use room temperature eggs to help the batter emulsify smoothly.
• Reduce the Guinness gently and keep an eye on the volume to avoid burning.
• For extra shine on the brownies, do not overbake. A few moist crumbs on a toothpick indicate optimal fudginess.

Storage

• Room temperature: Store in an airtight container for up to 3 days.
• Refrigerator: Keep frosted brownies in an airtight container for up to 5 days. Bring to room temperature before serving for best texture.

Freezing

• Unfrosted brownies: Wrap tightly and freeze for up to 3 months. Thaw overnight at room temperature, then frost.
• Frosted brownies: Freeze in a single layer on a baking sheet until firm, then transfer to an airtight container with parchment between layers. Thaw in the refrigerator, then bring to room temperature before serving.

Variations using existing ingredients only

• Make the espresso note more pronounced by increasing both the batter and frosting espresso powder to taste.
• For a deeper stout flavor in the frosting, use 3 tablespoons of reduced Guinness for a slightly thinner frosting and stronger malt presence.
• If you prefer less frosting sweetness, reduce the confectioners’ sugar by 1/4 cup and add a little extra reduced Guinness to balance texture.

Frequently Asked Questions

Q: Can I use a different stout or dark beer?
A: Yes. Other stouts or dark ales will work, but flavor will change slightly depending on the beer’s roast and bitterness.

Q: Do I have to reduce the Guinness?
A: Reducing concentrates the flavor and prevents excess liquid in the batter, so it is recommended.

Q: Is espresso powder necessary?
A: No. Espresso powder is optional, but it enhances and brightens the chocolate flavor.

Q: How can I tell when brownies are done?
A: Insert a toothpick into the center. A few moist crumbs are preferred for fudgy brownies.

Q: Can I make these ahead of time?
A: Yes. Bake in advance, cool, and frost just before serving for the best texture.

People Also Ask

Q: What does Guinness add to brownies?
A: Guinness adds roasted malt notes, depth, and a subtle bitterness that enhances the chocolate.

Q: How long does reduced Guinness keep?
A: Refrigerated in a sealed container, reduced Guinness will keep for about 3 to 4 days.

Q: Can I skip the frosting?
A: Yes. The brownies are rich enough to enjoy without frosting if you prefer less sweetness.

Q: Will the brownies taste boozy?
A: Most alcohol cooks off during baking, leaving behind flavor without strong boozy notes.

Q: Can I use salted butter instead of unsalted?
A: You can, but reduce added salt elsewhere or omit the frosting salt to prevent excessive saltiness.

Q: How do I get glossy brownie tops?
A: Whisking sugar into the warm chocolate mixture and not overbaking helps form a glossy top.

Conclusion

These Guinness Brownies with Guinness Frosting make a memorable dessert that balances rich chocolate, roasted malt, and a silky frosting. If you enjoy exploring stout in baked goods, you may also like this take on the classic found at WellPlated’s Guinness Brownies recipe. For another popular variation and helpful tips, see Sally’s Baking Addiction Guinness Brownies recipe. Give the recipe a try, share your results, and enjoy a cozy slice with friends or family.