Guinness Chocolate Brownies with Baileys Frosting Recipe

February 2, 2026

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Introduction

Guinness Chocolate Brownies with Baileys Frosting are a rich, fudgy treat infused with the deep, malty flavor of Guinness stout. These decadent brownies not only feature a luscious Baileys-infused Swiss meringue buttercream frosting, but they also combine chocolatey indulgence with a smooth boozy twist. Perfect for celebrating St. Patrick’s Day or any special occasion, these brownies are sure to impress your guests and satisfy your sweet tooth.

Why You’ll Love This Guinness Chocolate Brownies with

These brownies are not your average dessert; here’s why they stand out:

Rich chocolate brownies with stout flavor that elevate your dessert game.
Moist stout brownies recipe that guarantees a fudgy texture in every bite.
Easy Guinness chocolate brownie recipe that anyone can master.
Perfect balance of sweetness and depth, making them a go-to chocolate Guinness dessert.
Great for special occasions, especially St. Patrick’s Day.
Customizable with add-ins like nuts or extra chocolate chips for a decadent twist.

Ingredients for Guinness Chocolate Brownies with

Gather these items:

3oz (1/4 Cup + 2 Tablespoons) Guinness, reduced from 6oz (3/4 Cup)
1oz (2 Tablespoons) Unsalted Butter
250 Grams (1 1/4 cups) Granulated Sugar
90 Grams (3/4 cups) Dutch-process Cocoa Powder
3.5oz (scant 1/2 cup) Vegetable Oil
2 Teaspoons Pure Vanilla Extract
1 Large Egg Yolk, at room temperature
1 Large Egg, at room temperature
1/8 Teaspoon Baking Soda
1/2 Teaspoon Salt
1 Tablespoon Cornstarch (Cornflour)
75 Grams (scant 2/3 cup) All-Purpose Flour (Plain Flour)
2oz (1/4 cup) Chocolate chips, chunks, or bars chopped
1/2 Recipe of Baileys Swiss Meringue Buttercream

How to Make Guinness Chocolate Brownies with Step-by-Step

Step 1: In a large pot, add the full 6oz of Guinness and simmer over medium heat for 5-10 minutes until reduced by 50%, leaving 3oz of concentrated Guinness flavor.
Step 2: Add the unsalted butter and granulated sugar to the reduced Guinness. Cook on low heat until the butter melts and the sugar fully incorporates. Let cool for 5 minutes, then transfer the mixture to a separate bowl.
Step 3: Stir in the Dutch-process cocoa powder and vegetable oil to the cooled Guinness mixture until fully combined and smooth.
Step 4: Add the vanilla extract, large egg, and large egg yolk to the cocoa mixture, whisking thoroughly to combine.
Step 5: Mix in baking soda, salt, and cornstarch. Gently fold in the all-purpose flour using a spatula, stirring just until no flour streaks remain.
Step 6: Fold in the chopped chocolate chunks or chips gently without overmixing.
Step 7: Pour the batter into a 9-inch square pan lined with foil and greased heavily with non-stick spray. Bake in a preheated 350°F (180°C) oven for 25-27 minutes until a toothpick inserted comes out with moist crumbs.
Step 8: Allow brownies to cool completely. Using an offset spatula, pipe or spread swirls of Baileys Swiss Meringue Buttercream on top.
Step 9: Cut brownies into 9 to 16 pieces depending on desired serving size. Store at room temperature unless in a warm environment, then refrigerate to maintain texture.

Pro Tips for the Best Guinness Chocolate Brownies with

Keep these in mind:

Perfect for celebrating St. Patrick’s Day or any special occasion.
Store the brownies in an airtight container for freshness.
For extra richness, consider adding a pinch of espresso powder to enhance the chocolate flavor.

Best Ways to Serve Guinness Chocolate Brownies with

These brownies are perfect on their own, but here are some serving suggestions:

Serve warm with a scoop of vanilla ice cream for a delightful contrast.
Pair with a drizzle of chocolate sauce or caramel for an extra indulgent touch.
Top with whipped cream and chocolate shavings for an elegant presentation.

How to Store and Reheat Guinness Chocolate Brownies with

Store the brownies in an airtight container at room temperature. If your environment is warm, refrigerate them to maintain the perfect texture. When ready to enjoy, reheat briefly in the microwave for a warm, gooey treat.

Frequently Asked Questions About Guinness Chocolate Brownies with

What’s the secret to perfect Guinness Chocolate Brownies with?

The secret lies in the quality of the ingredients and not overmixing the batter. Using reduced Guinness ensures a rich flavor without excess liquid.

Can I make Guinness Chocolate Brownies with ahead of time?

Absolutely! These brownies store well and can be made a day in advance. Just keep them in an airtight container to maintain freshness.

How do I avoid common mistakes with Guinness Chocolate Brownies with?

To avoid common mistakes, ensure that ingredients are at room temperature and don’t overbake. Test with a toothpick; it should come out with moist crumbs, not dry.

Variations of Guinness Chocolate Brownies with You Can Try

Looking for some twists on the classic recipe? Here are a few variations:

Substitute half of the all-purpose flour with whole wheat for a slightly healthier option.
Add chopped nuts like walnuts or pecans for added texture.
Incorporate swirls of peanut butter or Nutella for a rich, indulgent flavor.
For a vegan option, try using flax eggs and dairy-free butter alternatives.

Delicious Guinness Chocolate Brownies with Baileys Frosting

For more delicious recipes, check out our recipe collection!

Ingredients for Guinness Chocolate Brownies with Baileys Frosting

For a delightful pairing, consider serving these brownies with a scoop of ice cream!

For more dessert ideas, try our Pumpkin Patch Cookies, Pistachio Cheesecake Delight, Chinese Beef Broccoli, Stovetop Ground Beef Chili, and Creamy Parmesan Italian Beef.

Guinness Chocolate Brownies with Baileys Frosting Recipe

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Author: Angela
Total Time: 1 hour
Yield: 9 to 16 servings 1x
Diet: Vegetarian

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Description

These Guinness Chocolate Brownies are a rich, fudgy treat infused with the deep, malty flavor of Guinness stout. Topped with a luscious Baileys-infused Swiss meringue buttercream frosting, these brownies combine chocolatey indulgence with a smooth boozy twist.

Ingredients

Scale

3oz (1/4 Cup + 2 Tablespoons) Guinness, reduced from 6oz (3/4 Cup)
1oz (2 Tablespoons) Unsalted Butter
250 Grams (1 1/4 cups) Granulated Sugar
90 Grams (3/4 cups) Dutch-process Cocoa Powder
3.5oz (scant 1/2 cup) Vegetable Oil
2 Teaspoons Pure Vanilla Extract
1 Large Egg Yolk, at room temperature
1 Large Egg, at room temperature
1/8 Teaspoon Baking Soda
1/2 Teaspoon Salt
1 Tablespoon Cornstarch (Cornflour)
75 Grams (scant 2/3 cup) All-Purpose Flour (Plain Flour)
2oz (1/4 cup) Chocolate chips, chunks, or bars chopped
1/2 Recipe of Baileys Swiss Meringue Buttercream

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Instructions

In a large pot, add the full 6oz of Guinness and simmer over medium heat for 5-10 minutes until reduced by 50%, leaving 3oz of concentrated Guinness flavor.
Add the unsalted butter and granulated sugar to the reduced Guinness. Cook on low heat until the butter melts and the sugar fully incorporates. Let cool for 5 minutes, then transfer the mixture to a separate bowl.
Stir in the Dutch-process cocoa powder and vegetable oil to the cooled Guinness mixture until fully combined and smooth.
Add the vanilla extract, large egg, and large egg yolk to the cocoa mixture, whisking thoroughly to combine.
Mix in baking soda, salt, and cornstarch. Gently fold in the all-purpose flour using a spatula, stirring just until no flour streaks remain.
Fold in the chopped chocolate chunks or chips gently.
Pour the batter into a 9-inch square pan lined with foil and greased heavily with non-stick spray. Bake in a preheated 350°F (180°C) oven for 25-27 minutes until a toothpick inserted comes out with moist crumbs.
Allow brownies to cool completely. Using an offset spatula, pipe or spread swirls of Baileys Swiss Meringue Buttercream on top.
Cut brownies into 9 to 16 pieces depending on desired serving size. Store at room temperature unless in a warm environment, then refrigerate to maintain texture.