Guinness Brownies are the decadent side of baking that celebrate the rich, dark flavor of beer while delivering mouthwatering chocolatey goodness. When you pair semi-sweet chocolate with a splash of stout, a magical transformation occurs—one that produces brownies with an incredibly moist texture and depth of flavor that’s hard to beat. The bittersweet notes from the Guinness not only enhance the chocolate but also bring a delightful richness that makes these brownies utterly irresistible.

Table of Contents

Why You’ll Love This Recipe
Ingredients You’ll Need
How to Make Guinness Brownies
Storing & Reheating
Chef’s Helpful Tips
Recipe FAQs
Guinness Brownies

I still remember the first time I stumbled upon this recipe. I was at a friend’s gathering, and someone brought a plate of these fudgy treats. One bite had me hooked! Since then, they’ve become a go-to recipe whenever I want to impress guests or simply indulge in something special myself. Whether enjoyed during a cozy night in or at a festive celebration, these brownies are sure to elicit smiles and request for the recipe. I encourage you to make these Guinness Brownies—you won’t regret it!

Why You’ll Love This Recipe

Simple & Quick: Whip these up in just 45 minutes, and everyone will think you’re a baking wizard!
Irresistible Flavor: The combination of semi-sweet chocolate and Guinness creates a rich, moist brownie with hints of depth that just captivates the taste buds.
Eye-Catching Appeal: The glossy frosting and dense chocolatey layers will make them the star of your dessert table.
Flexible Serving: Perfect for parties, gatherings, or just a special treat to enjoy solo.
Diet-Friendly Options: Looking for alternatives? You can easily adapt this recipe for gluten-free or dairy-free diets!

Ingredients You’ll Need

1 (11.2–12-ounce) bottle Guinness draught stout beer: The star of the show! It deepens the chocolate flavor and adds a unique richness.
3/4 cup (12 tbsp; 170g) unsalted butter: Provides moisture and richness for the brownies.
2 (4-ounce) bars (226g) semi-sweet chocolate, coarsely chopped: This is where fudginess comes from—use high-quality chocolate for the best results.
1 and 1/4 cups (250g) granulated sugar: Sweetness balances the stout flavor and enhances that decadent texture.
3 large eggs, at room temperature: Eggs help bind the brownies and add moisture.
1 teaspoon pure vanilla extract: Vanilla rounds out the flavors nicely.
1 cup (125g) all-purpose flour: The structure of the brownies comes from this ingredient.
1/2 teaspoon salt: Enhances flavor and balances the sweetness.
Optional: 1/2 teaspoon espresso powder: This intensifies the chocolate flavor without making it taste like coffee.
1/2 cup (8 tbsp; 113g) unsalted butter, softened to room temperature: Used in the frosting to make it smooth and creamy.
2 cups (240g) confectioners’ sugar: For that sweet, creamy frosting we love.
2-3 tablespoons reduced Guinness (from step 1): Adds flavor to the frosting, creating that perfect topping.
1 teaspoon espresso powder: Boosts the chocolate flavor in the frosting too.
1/2 teaspoon pure vanilla extract: Ties the frosting flavors together.
1/4 teaspoon salt: Just the right amount to enhance sweetness in the frosting.

How to Make Guinness Brownies

Reduce the Guinness: In a small saucepan, bring the Guinness to a boil over medium-high heat. Once boiling, reduce the heat to medium and let it simmer until it reduces to 2/3 cup (approximately 160ml), about 12–15 minutes. Allow it to cool for at least 10 minutes. You’ll use 1/2 cup (120ml) in the brownies and the rest in the frosting.
Preheat and Prepare: Preheat your oven to 350°F (177°C). Grease a 9-inch square baking pan or line it with parchment paper, leaving an overhang on the sides. This will make lifting your brownies out much easier for cutting.
Melt Chocolate and Butter: In a large microwave-safe bowl, combine the chopped chocolate and 3/4 cup (170g) unsalted butter. Melt them together in the microwave in 30-second intervals, stirring after each, until fully melted and smooth.
Combine Ingredients: Whisk in the granulated sugar and 1/2 cup (120ml) of reduced Guinness until well combined. Next, stir in the eggs and vanilla extract. Slowly add in the flour, salt, and optional espresso powder to create a thick, shiny batter.
Bake: Pour the batter into your prepared pan, spreading it out evenly. Bake for about 32 minutes. To check for doneness, insert a toothpick into the center; it should come out with a few moist crumbs. If it’s too wet, bake for an additional couple of minutes, checking frequently.
Cool: Once baked, remove from the oven and let the brownies cool completely in the pan on a cooling rack before frosting.
Make the Frosting: Using a mixer, beat 1/2 cup (113g) softened butter on high speed for 2–3 minutes until creamy. Gradually add the confectioners’ sugar, starting on low and moving to high speed until combined. Mix in 2 tablespoons of reduced Guinness, the espresso powder, vanilla extract, and salt. If the frosting is too thick, add a splash of milk until you reach the desired consistency.
Frost and Serve: Once the brownies have cooled, lift them out of the pan using the parchment overhang, and transfer them to a cutting board. Spread the frosting over the brownies, then use a sharp knife to cut into squares.

Storing & Reheating

To store your delightful brownies, keep them at room temperature in an airtight container for up to a week. If you want to extend their life, you can refrigerate them for up to two weeks. You can even freeze them for up to three months—just wrap each brownie individually in plastic wrap and place them in a freezer-safe bag. Reheat in the oven at 350°F (about 5-10 minutes) for the best flavor revival, but expect slight changes in texture due to freezing.

Chef’s Helpful Tips

To avoid dry brownies, be careful not to overbake; start checking at 32 minutes.
Always let your eggs come to room temperature for a smoother batter.
Use high-quality chocolate bars for richer flavor.
If your brownies seem too dry, try adding a bit more melted butter or vanilla.
Experiment with different kinds of chocolate, like dark or milk chocolate, for variation.
These brownies can be made ahead and frozen; wrap them up tight to prevent freezer burn.

Guinness Brownies are not just a dessert; they are an experience. The flavors of rich chocolate married with stout create a unique treat that is simply delightful. Don’t hesitate to add your creative touch—like nuts or different toppings—and enjoy the journey of baking. I hope you revel in every bite!

Recipe FAQs

Can I use a different type of beer for this recipe?

Absolutely! While Guinness gives a fantastic flavor, you can substitute with another stout or even a porter. Just note that the flavor may slightly vary, but it will still be delicious!

What if I can’t find espresso powder?

If you don’t have espresso powder on hand, you can skip it altogether or use finely ground coffee as a substitute. Just remember that a little goes a long way, as it is quite potent.

How can I make these brownies gluten-free?

You can substitute the all-purpose flour with a gluten-free flour blend. Look for one that measures 1:1 like regular flour to maintain the same texture.

How should I serve these brownies?

These brownies are perfect on their own, but you can elevate them by serving with a scoop of vanilla ice cream or a dollop of whipped cream and a drizzle of chocolate sauce. They also look amazing with a sprinkle of sea salt on top!

More BROWNIES & BARS Recipes

Did You Enjoy Making This Recipe? Please rate this recipe with ⭐⭐⭐⭐⭐ or leave a comment.

📖 Recipe Card

Guinness Brownies

5 Stars 4 Stars 3 Stars 2 Stars 1 Star No reviews

Author: Peter
Prep Time: 45 minutes
Cook Time: 180 minutes
Total Time: 3 hours 45 minutes
Yield: 16 servings 1x
Category: BROWNIES & BARS
Method: Baking
Cuisine: American

Print Recipe

Description

These Guinness Brownies are a delightful treat combining the rich taste of stout beer and chocolate, creating a moist and flavorful dessert that’s easy to make. Ideal for gatherings or a cozy night in, this recipe brings comfort to any occasion with its simple ingredients and unique flavor profile.

Ingredients

Scale

one (11.2–12-ounce (330–355ml) bottle guinness draught stout beer
3/4 cup (12 tbsp; 170g) unsalted butter
two 4-ounce bars (226g) semi-sweet chocolate, coarsely chopped
1 and 1/4 cups (250g) granulated sugar
3 large eggs, at room temperature
1 teaspoon pure vanilla extract
1 cup (125g) all-purpose flour (spooned & leveled)
1/2 teaspoon salt
optional: 1/2 teaspoon espresso powder
1/2 cup (8 tbsp; 113g) unsalted butter, softened to room temperature
2 cups (240g) confectioners’ sugar
2–3 tablespoons reduced guinness (from step 1)
1 teaspoon espresso powder
1/2 teaspoon pure vanilla extract
1/4 teaspoon salt

Cook Mode Prevent your screen from going dark

Instructions

Bring the Guinness to a boil in a small saucepan, then reduce to medium heat and simmer until reduced to 2/3 cup (160g/ml), about 12–15 minutes. Allow to cool for at least 10 minutes.
Preheat the oven to 350°F (177°C) and prepare a 9-inch square baking pan by greasing it or lining it with parchment paper.
In a microwave-safe bowl, melt butter and chopped chocolate in 30-second intervals, whisking between until smooth. Mix in sugar and 1/2 cup (120g/ml) of reduced Guinness until well blended, then whisk in eggs and vanilla. Finally, stir in flour, salt, and optional espresso powder until the batter is thick and shiny. Pour into the prepared pan.
Bake for approximately 32 minutes, then check with a toothpick. If the toothpick comes out clean with a few moist crumbs, the brownies are done. Adjust baking time as needed, usually around 35 minutes total.
Remove from the oven and cool completely in the pan on a cooling rack before frosting or cutting.
For frosting, beat softened butter until creamy, then add confectioners’ sugar and mix until combined. Blend in 2 tablespoons of reduced Guinness, espresso powder, vanilla, and salt, adjusting thickness with more reduced Guinness or a splash of milk if necessary.
Once cooled, lift brownies out by the parchment overhang and frost. Cut into squares when ready to serve.
Store any leftover brownies covered at room temperature for up to 1 week.

Notes

Ensure the Guinness is reduced properly for better flavor and frosting consistency.
Feel free to adjust the amount of espresso powder based on your coffee preference.