Easy Guinness Brownies

5 from 1 vote

Rich, fudgy Guinness Brownies made with brownie mix and topped with creamy Guinness buttercream. An easy, chocolatey dessert perfect for St. Patrick’s Day or anytime.

Prep Time10

Cook Time34

Total Time44

Course: Dessert

Cuisine: American

Servings: brownies

Calories: 331kcal

Author: Linda Warren

Ingredients

Brownies

1 box brownie mix (18.2 oz) I use Duncan Hines.
⅓ cup Guinness Extra Stout
2 eggs
¼ cup avocado or vegetable oil
¼ cup butter melted

Frosting

½ cup unsalted butter room temperature
2 ½ cups powdered sugar
¼ teaspoon salt
1 teaspoon vanilla extract
2-3 Tablespoons Guinness

Instructions

Brownies

Preheat oven to 350°F. Lightly spray a 8x8-inch pan with cooking spray. Line with parchment paper and spray again. Let it extend up the side to help with easy removal after baking.
In a medium bowl, mix all ingredients with a spoon until fully incorporated.
Pour the brownie batter into the prepared pan and smooth top.
Bake for 30-35 minutes. Let cool in dish then remove by lifting the parchment paper. Brownies are done when toothpick inserted in the center comes out clean.

Frosting

Combine all frosting ingredients and mix well with a standard mixer or a spoon. Add the additional tablespoon of Guinness if the frosting is too thick. If the frosting is too thin, add more powdered sugar.
Spread on cooled brownies then cut into squares.

Notes

STORE/FREEZE

Store brownies in an airtight container in the refrigerator for up to 1 week.

Freeze them in a freezer-safe container for up to 3 months. Thaw in the refrigerator overnight before serving.

Nutrition