Calling all cookie lovers. You will love this Frosted Guinness Cookie Bar. It’s the new way to cookie!

Think soft and chewy butterscotch cookie with the added depth of Guinness’s coffee and malt notes minus the hassles of scooping and shaping cookies and baking one batch at a time.
The best part about this recipe is it’s completely customizable. You can take the base recipe and pump it with your favorite add-ins. Try crushed bacon, potato chips, pretzels, chopped chocolate, toffee bits, or your favorite candy for a sweet and salty finish . . .so many possibilities!
Below are a few notes to keep in mind, and I’ve tried to anticipate some questions you might have.
- Guinness: You might be asking if the 2 teaspoons of Guinness is necessary. Do you really need the two teaspoons of vanilla? Yes. The slight and subtle coffee notes and malt flavors of Guinness adds a counterpoint to the sweetness.
- Flour: I used a mix of bread and all-purpose flour for a more tender finish. If you don’t have any bread flour on hand, you can replace it with all-purpose flour. Keep in mind the cookies will not have that chewy soft, tender texture that following the flour ratio in the recipe will yield.
- Eggs: Resist the urge to go with 2 whole eggs. The lack of egg white in the second egg keeps the hydration of the recipe in balance.
- Frosting: Of course, you don’t need it, but why would you skip it? It’s like a cookie and cupcake mash-up! Aside from that, where else will the sprinkles go?
Now that we have the details and notes out of the way, fire up the oven and get your Guinness ready. Never mind milk, that is so 2022!


Frosted Cookie Bars
Ingredients
- 1 cup (5oz/135g) bleached all-purpose flour
- 1 cup (5oz/135g)bread flour
- ½ teaspoon baking soda
- ½ teaspoon table salt
- ½ cup (2oz/50g) chopped pecans
- 12 tablespoons unsalted butter
- 1 cup (7oz/195g) light brown sugar
- ½ cup (3.5oz/105g) granulated sugar
- 1 large egg + 1 egg yolk
- 2 teaspoon Guinness
- 2 teaspoons vanilla extract
- 2 cups preferred buttercream frosting (homemade recipe included at the end of recipe instructions)
Instructions
Heat oven to 325 degrees. Adjust oven rack to lower-middle position. Line a 13x9-inch pan with a foil sling.
In a large bowl, whisk together the all-purpose and bread flour, baking soda, and salt; aside.
In a skillet, over medium heat, add 8 tablespoons of butter. Cook and stir until butter is dark golden brown and has a nutty aroma, about 3 to five minutes. Remove the skillet from the heat and transfer browned butter to a large heatproof bowl. Add the remaining 4 tablespoons of butter and whisk to combine. This will help to cool the brown butter.
Add brown and white sugar and whisk to combine. Add the egg, egg yolk, Guinness, and vanilla, and using a stand mixer or hand-held mixer, beat until the mixture is well combined.
Fold in the flour mixture just until there are no visible streaks of flour. Do not over-mix. Scrape dough into the prepared pan.
Bake until the top is light golden brown and the edges start pulling towards the center, about 22 to 25 minutes. Remove from oven and let it cool completely on a wire rack. The residual heat will continue to slowly bake the cookie bars. Remove bars from the pan by using the foil sling. Spread the frosting on top, then decorate with sprinkles. Cut and serve.
To make the frosting: Place 8 tablespoons of room temperature butter in a large bowl. Beat the butter until creamy, about 1 minute. Add 1 cup of powdered sugar and beat on low until combined. Repeat with the remaining cup of powdered sugar. Add 2 tablespoons of milk and 1 tablespoon of vanilla extract until the frosting is light and fluffy. (*If the frosting is too stiff, add another tablespoon of milk to loosen it.)
These frosted cookie bars look absolutely irresistible. They are like a little slice of happiness and the colourful frosting on top adds a fun and festive touch. I can’t wait to give your recipe a try.
I can’t resist these delicious cookies.
I can’t resist the allure of these frosted cookie bars. The bright icing makes them seem even more festive, and they’re like a small slice of joy. I am really looking forward to trying your recipe.
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I like cookies because they give you a nice feeling and are not overly sweet. I also like this dessert.
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These look amazing! Love the idea of combining Guinness with a sweet treat—can’t wait to try this recipe!
Okay, this Frosted Guinness Cookie Bar sounds amazing! Love the idea of adding Guinness to cookies. And the customizable options? Genius! I gotta try this recipe soon.
What is the significance of not over-mixing the flour mixture when making the cookie bars?
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Omg, these Frosted Guinness Cookie Bars sound amazing! Butterscotch cookie with Guinness?! Plus, you can add bacon? I’m so trying this recipe this weekend! Gotta get my Guinness ready!
Ooh, this Frosted Guinness Cookie Bar recipe sounds amazing! I love that you can customize it with different toppings. Might have to try this weekend!
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This Frosted Guinness Cookie Bar recipe looks absolutely delicious! I love the idea of incorporating Guinness for added depth. The notes on flour and eggs are super helpful, and the customizable add-ins make this recipe even more appealing. I’m definitely going to try this soon. If you’re looking for a fun way to share your baking creations, check out AI Cartoon Generator to turn your photos into cool cartoons!
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These Frosted Guinness Cookie Bars sound amazing! I love the idea of adding Guinness to the cookie dough for that extra depth of flavor. And the customization options are endless – I’m thinking of trying it with pretzels next time. Speaking of creativity, if you’re looking for a fun way to personalize your pictures, check out AI Cartoon Generator for turning them into cartoons!
These Frosted Guinness Cookie Bars sound delicious! I love the idea of adding Guinness for that subtle coffee and malt flavor. And the customizable add-ins are a great way to make it your own. Speaking of experimenting, I recently tried AI Beauty Rating just for fun and it gave some interesting insights. I’m definitely going to try this cookie bar recipe soon!
These Frosted Guinness Cookie Bars sound amazing! I especially love the idea of customizing them with different add-ins. The tip about using both bread and all-purpose flour is really helpful. Speaking of creativity, if anyone is looking for inspiration for character development, I recommend checking out the Character Headcanon Generator. It’s a great resource for creating unique character backstories. Can’t wait to try this recipe!
These Frosted Guinness Cookie Bars sound amazing! I love the idea of adding Guinness for that subtle coffee and malt flavor. And the customization options are endless. I’m thinking of trying a batch with crushed pretzels for a sweet and salty kick. By the way, if anyone needs to convert recipe notes or instructions from Markdown to Word for easier sharing, I recommend checking out Markdown to Word.
These Frosted Guinness Cookie Bars sound amazing! I love the idea of adding Guinness for that subtle coffee and malt flavor. The customizable add-ins are a great touch too. I’m already thinking of trying crushed pretzels and toffee bits. Speaking of recipes, sometimes I need to quickly combine images of recipes I find online. I use Merge JPG for that; it’s a really handy and fast tool!
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This Frosted Guinness Cookie Bar sounds absolutely delicious! I’m especially intrigued by the idea of a soft butterscotch cookie infused with Guinness’s coffee and malt notes. Plus, skipping the individual cookie shaping is a huge bonus. The customization options, especially with bacon or potato chips, sound like an amazing sweet and salty twist. Can’t wait to give this a try!
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These Frosted Guinness Cookie Bars sound incredible, Naomi! Love the butterscotch and Guinness combo. The customizable aspect is fantastic. I’m thinking chopped pretzels and maybe a hint of chili flakes for a spicy kick. This recipe reminds me of the addicting fun of Block Blast! Has anyone tried adding espresso powder to enhance the coffee notes from the Guinness?
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Omg, this Frosted Guinness Cookie Bar looks absolutely delicious! The idea of adding Guinness to a cookie is genius, and the customizable toppings are a total game-changer. Definitely gonna try this recipe this weekend!
This recipe sounds absolutely delicious and so fun to customize! I love the idea of adding Guinness for subtle coffee and malt notes it really elevates the flavor without being overpowering. The tip about using a mix of bread and all-purpose flour for that soft, chewy texture is super helpful. I also appreciate the detailed instructions for browning the butter and keeping the dough perfectly balanced. The frosting on top makes it feel like a cookie-cupcake hybrid, and the sprinkle suggestion is such a playful touch. Definitely inspiring to try this for a special treat or a fun baking project!
Try crushed bacon, potato chips, pretzels, chopped chocolate, toffee bits, or your favorite candy for a sweet and salty finish . . .so many possibilities!
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This recipe for Frosted Guinness Cookie Bars sounds delicious! I adore that you can add different toppings to make it uniquely yours. I might have to give it a shot this weekend!
These Frosted Guinness Cookie Bars sound amazing! I love the idea of a soft butterscotch base with Guinness for extra flavor. The customizable add-ins like bacon or pretzels are a fun twist—can’t wait to try this recipe!
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These Frosted Guinness Cookie Bars sound amazing! I love the idea of adding Guinness to the cookie dough for that extra depth of flavor
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I never would have thought to incorporate Guinness into a cookie bar, but the depth of those malt notes sounds like a complete game-changer for a butterscotch base. The idea of using potato chips or pretzels for that salty crunch is genius and makes the recipe feel so versatile for any occasion. When I’m not experimenting with new baking recipes in the kitchen, I find it relaxing to solve a few puzzles on ZooBlocks Game to unwind.
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Crushed potato chips in these sounds like a game changer. Definitely trying that out for my next batch.
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Love the creative use of Guinness to add depth! A time-saving bar format with that sweet-salty potential sounds absolutely genius.
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The note about the small amount of Guinness adding coffee and malt depth is helpful. I also like that the base is flexible enough for salty add-ins like pretzels or toffee bits, which makes the recipe easier to adapt for different gatherings.
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The note about the small amount of Guinness adding coffee and malt depth is helpful, thnaks for sharing