Get ready for St. Patrick’s Day with these Guinness Brownies. The depth of flavor in the chocolate mixture is amazing and the recipe is so easy. Each bite is fudgy and yummy.

Squares of brownies ready to serve.
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We love brownie recipes and Guinness Brownies are so tasty with decadent frosting. They aren’t overly sweet because of the Guinness and have a great flavor. I also love to make Raspberry Cheesecake Brownies and The Best Butterscotch Brownies Recipe.

This recipe makes a great dessert with Corned Beef for St. Patty’s Day. I have been making these brownies for at least 10 years and it’s super easy!

Why we love this recipe

  • Perfect taste and texture.
  • Easy to follow recipe.
  • Basic ingredients.

Ingredients

Ingredients for recipe - oil, beer, sugar, vanilla, butter, eggs, flour, cocoa powder.
  • Vegetable Oil 
  • Guinness Stout Beer 
  • Granulated Sugar 
  • Vanilla Extract 
  • Salted Butter (melted and cooled) 
  • Large Eggs 
  • All Purpose Flour 
  • Cocoa Powder 

Frosting

  • Unsalted Butter (softened) 
  • Powdered Sugar 
  • Vanilla Extract 
  • Guinness Stout Beer 

Step by step instructions

  • Step 1. First, go ahead and preheat the oven to 350 degrees f. Then line a 9X9 baking pan with parchment paper and make sure that the paper over hangs the pan for easy removal of the brownies. 
Mixing bowl with oil, sugar and vanilla.

Step 2. Get out a large bowl, whisk together the vegetable oil, Guinness, sugar and vanilla extract. 

Butter and eggs added to mixture and combined.

Step 3. Next, add in the butter and eggs. Mix until well combined. In a separate bowl, stir together the flour and cocoa powder until combined. 

Brownie mixture poured into pan.

Step 4. Then add the dry ingredients into the butter/oil mixture until just combined. Spread the batter into the baking dish.  Bake for 35-38 minutes until a toothpick inserted into the center of the brownies comes out clean or with moist crumbs.

Brownies baked and cooling.

Step 5. Allow the brownies to cool completely at room temperature on a wire rack before topping them with the frosting.  

Butter in bowl beat until fluffy.

Step 6. While the brownies cool, make the frosting. Beat the butter. I used a large mixing bowl of a stand mixer with a paddle attachment. Beat until light and fluffy (approximately 1 minute). 

Powdered sugar added to mixture.

Step 7. Next, gradually add the powdered sugar. Combine on low speed until combined. Then add in the vanilla extract and Guinness beer.  Continue to mix until the frosting is smooth. Then check the frosting consistency and gradually add in the last tablespoon of Guinness until the frosting is the consistency you prefer. 

Frosting spread on brownies in pan.

Step 8. Spread the frosting over the cooled brownies.  

Brownies cut into bars.

Step 9. Remove the brownies from the pan by lifting them up with the parchment paper.  Slice the brownies into squares and then they are ready to serve and enjoy! 

Brownies cut into bars and ready to serve.

Storage

Refrigerate the leftovers in an airtight container up to 5-6 days. 

FAQs

Can you use alcohol free Guinness Beer?

Yes, you can use any variety of Guinness Beer that you prefer.

Is this recipe freezer friendly?

The recipe is very easy to freeze and enjoy later. Allow to cool and place inside a freezer bag or container.

Freeze the brownies up to 3 months. Allow to thaw in the refrigerator overnight when ready to serve.

Can you omit the frosting?

You do not have to use the frosting if desired. However, it really elevates the flavor of the recipe and makes it even better. I definitely recommend using the frosting.

Brownies cut into bars.

More Easy Brownie Recipes

Make Guinness Chocolate Brownies for the best homemade brownies with Guinness flavor. Don’t forget to leave a comment and star rating.

Guinness Brownies

5 from 3 votes
Get ready for St. Patrick's Day with these Guinness Brownies. The depth of flavor in the chocolate mixture is amazing and the recipe is so easy. Each bite is fudgy and yummy.
Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings 16
Cuisine American
Course Dessert
Calories 326

Ingredients

For the Brownies:

For the Frosting:

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Instructions

For the Brownies:

  • Preheat the oven to 350 degrees Fahrenheit and line a 9X9 baking dish with parchment paper and make sure that the paper over hangs the pan for easy removal of the brownies.
  • In a large mixing bowl, stir together the vegetable oil, Guinness, sugar and vanilla extract.
  • Add in the butter and eggs. Mix until well combined.
  • In a separate bowl, stir together the flour and cocoa powder until well combined.
  • Slowly add the dry ingredients into the butter/oil mixture until just combined.
  • Pour the batter into the prepared pan into an even layer.  Bake for 35-38 minutes until a toothpick inserted into the center of the brownies comes out clean.
  • Let the brownies cool completely at room temperature before topping them with the frosting.

For the Frosting:

  • Beat the butter in a large mixing bowl of a stand up mixer with a paddle attachment until light and fluffy (approximately 1 minute).
  • Slowly add in the powdered sugar and mix on low speed until combined.
  • Add in the vanilla extract and 2 tablespoons of the Guinness beer.  Continue to mix until the frosting is smooth and fluffy (3-4 minutes).  Then check the frosting consistency and gradually add in the last tablespoon of Guinness until the frosting is the consistency you prefer.
  • Spread the frosting over the cooled brownies.
  • Carefully remove the brownies from the pan by lifting them up with the parchment paper.  Slice the brownies into squares and then they are ready to serve and enjoy!

Recipe Notes

Refrigerate the leftovers in an airtight container for up to 5-6 days.

Nutrition Facts

Calories 326kcal, Carbohydrates 52g, Protein 2g, Fat 13g, Saturated Fat 6g, Polyunsaturated Fat 2g, Monounsaturated Fat 3g, Trans Fat 0.4g, Cholesterol 43mg, Sodium 33mg, Potassium 78mg, Fiber 2g, Sugar 43g, Vitamin A 296IU, Calcium 12mg, Iron 1mg

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About the Author

Hi, I’m Carrie. Welcome to Desserts on a Dime!

I’m on a mission to help you create delicious desserts on a budget and do not require a ton of time. Together, we are going to make something sweet that the entire family will love!

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