Guinness Brownies with Bailey’s Buttercream Frosting

by megan on March 16, 2012

I am ready for tomorrow’s St. Patrick’s Day party! I have seen many versions of Guinness Brownies the past couple of days, and decided to come up with my own version. I whipped up 36 of these delicious brownies and 35 of them are ready to go. I couldn’t resist taste testing! I just might have taken a spoon to the bottom of frosting bowl after all the brownies were topped!! I am definitely making these little gems again!!! The recipe below makes 12 brownies. Enjoy!

Guinness Brownies with Bailey’s Buttercream Frosting


1 box Pillsbury Dark Chocolate Brownie Mix (Family size)

1/2 cup oil

2 eggs

1/4 cup Guinness Extra Stout Beer

1 cup Dark Chocolate Chips

2 sticks Unsalted Sweet Cream Butter (softened)

3 tablespoons Bailey’s Irish Cream

4 tablespoons Heavy Whipping Cream

4 cups Powdered Sugar


1. Preheat oven to 350 degrees (325 degrees if using dark pan). Place cupcake liners in pan.

2. Combine brownie mix, oil, eggs, and Guinness until well blended.

3. Stir in chocolate chips.

4. Fill cupcake liners 2/3 full with batter.

5. Bake for 20-25 minutes.

6. Cool brownies completely.

7. Cream softened butter until fluffy.

8. Add sugar and continue creaming until well-blended.

9.Add Bailey’s and whipping cream; blend on low speed until moistened.

10. Beat at high speed until icing is fluffy.

11. Frost the brownies as desired. (I added chocolate shavings for extra decoration)


What are you doing to celebrate St. Patty’s Day?


{ 8 comments… read them below or add one }

Shelby March 17, 2012 at 12:15 pm

Feel free to ship some to me! :)

BTW my latest post has those same muffin cups in it. ;)

Eric March 19, 2012 at 2:58 pm

Those brownies look awesome……and I had several cans of Guiness in the fridge too but they were consumed the old fashioned way :-)

Cookin' Cowgirl March 20, 2012 at 1:42 pm

Cool! I love taking something like a brownie mix and bringing LIFE to it!! These sound and look incredible! Hope you saved me one! ;)
Thanks for stopping by my facebook page, hope you’ll check out my blog too.
Have a wonderful day!

Colleen @ Culinary Colleen March 22, 2012 at 4:01 pm

Yum! I’m not a huge fan of Guinness, but I love it in desserts!

Fried Green Aprons March 25, 2012 at 3:55 am

The PERFECT cupcake recipe !! Can’t wait till my hubby sees this one :) Thanks !

megan March 25, 2012 at 6:14 pm

Thanks! I hope he enjoys it!

Yoshiblue March 26, 2012 at 4:12 pm

These Guinness brownies with Bailey’s buttercream frosting sound amazing. Thanks for the recipe.

Maria February 18, 2013 at 7:34 pm

It does not tell you what to do with the 4 cups of powdered sugar

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