Bring the Guinness to a boil then reduce to a simmer. Let the beer to simmer until reduced to about ⅓ cup, about 25 to 30 minutes. Cool for 10 to 15 minutes before making the brownie batter.
12 ounces Guinness Extra Stout beer
To Make the Brownies:
Preheat the oven to 350°F, and line an 8x8-inch baking pan with parchment paper. Set aside.
Melt the butter in a medium saucepan over low heat. Add the sugar, vanilla, and eggs. Whisk to combine.
1 cup unsalted butter, 2 cups granulated sugar, 2 teaspoons vanilla extract, 4 large eggs
Pour in the Guinness reduction and stir until mixed.
Sift in the flour, cocoa powder, salt, and espresso powder and whisk until just combined. Don’t overmix; otherwise, the brownies will be dense and tough.
1 cup all-purpose flour, ½ cup unsweetened cocoa powder, ½ teaspoon salt, ½ teaspoon instant espresso powder
Stir in the baker’s chocolate, and stir until melted. Transfer the batter to the prepared baking dish. Bake for 35 to 45 minutes or until a toothpick inserted in the center comes out clean or with a couple of crumbs.
8 ounces semi-sweet baker’s chocolate
Remove from the oven, and allow to cool for a few minutes before frosting.
To Make the Bailey’s Frosting:
In a large saucepan, whisk together the butter and Bailey’s until the butter melts.
¼ cup unsalted butter, 3 tablespoons Bailey’s Irish Cream liqueur
Remove from heat, and whisk in the powdered sugar. Pour the frosting over the brownies and spread into an even layer. Slice and enjoy!
2 cups powdered sugar
Notes
The calories listed are an approximation based on the ingredients in the recipe card and a serving size of 1 brownie. Actual calories will vary.
Cut into 9 or 16 servings.
Brownies made be made in a 9x9-inch pan OR a glass pan. We have information for both of these methods in the "Tips for Success" section of the post.
The frosting contains alcohol that may not cook out all the way.
Store leftovers in the fridge for 5 days.
Nutrition Facts
Guinness Brownies with Baileys Frosting
Serving Size
1 brownie
Amount per Serving
Calories
421
% Daily Value*
Fat
24
g
37
%
Saturated Fat
14
g
70
%
Trans Fat
1
g
Polyunsaturated Fat
1
g
Monounsaturated Fat
7
g
Cholesterol
79
mg
26
%
Sodium
207
mg
9
%
Potassium
189
mg
5
%
Carbohydrates
53
g
18
%
Fiber
4
g
16
%
Sugar
40
g
44
%
Protein
5
g
10
%
Vitamin A
503
IU
10
%
Calcium
30
mg
3
%
Iron
3
mg
17
%
* Percent Daily Values are based on a 2000 calorie diet.