Decadent Espresso Brownie Cups with Bailey’s Irish Cream Buttercream: Your Ultimate St. Patrick’s Day Treat
Prepare for a truly special St. Patrick’s Day celebration with these irresistible Espresso Brownie Cups, crowned with a luscious Bailey’s Irish Cream Buttercream Frosting! These treats are not just easy to make, they’re packed with rich espresso and the unmistakable creamy kick of Bailey’s in every bite, delivering a taste experience akin to your favorite Irish coffee.

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Why These Bailey’s Brownie Cups Are Your St. Patrick’s Day Must-Make
Listen up, fellow dessert enthusiasts! If you’re planning on making just *one* Irish-themed recipe this St. Patrick’s Day, let it be these incredible Espresso Brownie Cups. Seriously, these aren’t just good; they’re dangerously delicious. I devoured them with such speed that they barely lasted a few days in my kitchen. I practically had to give away more than half to family and friends just to keep myself from eating the entire batch!

The combination of rich chocolate, robust espresso, and the smooth, creamy notes of Bailey’s Irish Cream is pure magic. Each miniature brownie cup is a perfect vessel for a generous dollop of velvety buttercream, making every bite a heavenly experience. They are utterly addictive, delightfully potent, and unbelievably easy to prepare, making them the ideal festive treat for any St. Patrick’s Day gathering or a cozy indulgence for yourself.

Honestly, I wish I had one right here on my desk as I write this. My mouth is watering, and my stomach is rumbling, even though I just ate! Ah, the delightful curse of being a food-obsessed crazy person when such a delicious treat comes to mind. These brownie cups aren’t just desserts; they’re little bites of pure joy, designed to captivate your senses and leave you craving more.
The Secret to Effortless Perfection: Box Mix Magic
Now, here’s a little secret: this espresso brownie cups recipe is incredibly easy because we’re embracing a fantastic shortcut. Instead of whipping up brownies from scratch, I opted for a good quality brownie mix this time. I know, I know, some might gasp at not making them from scratch, but truly, sometimes you just need a killer shortcut that delivers amazing results. And with a few simple additions, you can transform a basic mix into something spectacular.

Elevating the Brownie Base: Espresso & Bailey’s
The real magic happens when you infuse the brownie mix with instant espresso powder and a touch of Bailey’s Irish Cream Liqueur. These two ingredients are simple yet powerful ways to elevate the flavor profile of an ordinary brownie. The espresso powder deepens the chocolate flavor without necessarily making it taste strongly like coffee – it just makes the chocolate richer and more complex. Think of it as chocolate’s best friend! Then, the Bailey’s adds a subtle warmth and creaminess, a hint of that signature Irish whiskey flavor that perfectly complements the chocolate and coffee notes.

By adding these special ingredients to your store-bought brownie mix, you create a depth of flavor that tastes entirely homemade and sophisticated. It’s a trick that saves you time without sacrificing an ounce of taste. You get all the fudgy goodness of brownies, but with an adult, festive twist that’s perfect for St. Patrick’s Day or any occasion that calls for a truly decadent dessert. These simple additions transform a basic dessert into an extraordinary experience, proving that sometimes, the best recipes are those that cleverly combine convenience with gourmet flair.
Crafting the Dreamy Bailey’s Buttercream Frosting
Once the rich, espresso-infused brownie cups are baked, they get topped off with a generous swirl of Bailey’s buttercream frosting. This frosting isn’t just an afterthought; it’s the crowning glory of these delightful treats. The buttercream boasts an ideal texture – silky smooth and wonderfully fluffy – and a flavor that harmonizes perfectly with the deep chocolate and coffee notes in the brownie cups. The Bailey’s in the frosting intensifies the Irish cream experience, adding a creamy, slightly boozy sweetness that ties everything together beautifully.
Making this buttercream is straightforward. You’ll start with softened unsalted butter, then gradually beat in Bailey’s Irish Cream Liqueur until well combined. The secret to a truly fluffy buttercream lies in slowly incorporating powdered sugar and then beating the mixture on a medium-high speed for several minutes. This process whips air into the frosting, making it light and airy, yet still rich and stable enough to pipe. Don’t forget to scrape down the sides of your mixing bowl occasionally to ensure all ingredients are fully incorporated and you achieve that consistently smooth texture.
Finally, a sprinkle of festive St. Patrick’s Day themed sprinkles takes these brownie cups from delicious to absolutely dazzling. The visual appeal is undeniable, making them perfect for parties or as a charming gift. It’s truly something magical you’ll have on your hands – so much better than finding a leprechaun at the end of the rainbow, that’s all I can say!
Assembling Your Delicious Brownie Cups
The assembly of these brownie cups is as fun as it is simple. After preparing your doctored-up brownie batter, you’ll portion it into a greased 12-cup muffin tin. The baking process is quick, and the real trick comes immediately after they’re out of the oven. While still warm and pliable, use the bottom of a shot glass or a small, round object to gently press down in the center of each brownie. This creates the perfect “cup” indentation, ready to be filled with that irresistible Bailey’s buttercream. Allowing the brownies to cool completely before frosting is crucial; it ensures the buttercream holds its shape and doesn’t melt into a delicious, but messy, puddle.
Once cooled, the fun of decorating begins! Using a piping bag fitted with your favorite tip, generously fill each brownie cup with the creamy Bailey’s buttercream. Whether you opt for a simple swirl or a more elaborate design, the rich frosting will make these cups look as good as they taste. A final touch of festive sprinkles, perhaps in green and white, adds that celebratory flair, making them truly stand out. These brownie cups are not only a feast for the taste buds but also a treat for the eyes.

Serving and Storing Your Irish Coffee Inspired Treat
These Espresso Brownie Cups with Bailey’s Buttercream are incredibly versatile. They are, of course, the perfect centerpiece for a St. Patrick’s Day dessert table, but their decadent flavor profile makes them suitable for any celebration or simply as a special weekend indulgence. Serve them alongside a freshly brewed cup of coffee for an ultimate coffee shop experience at home, or perhaps with an actual Irish coffee for an extra boozy treat. They also make wonderful edible gifts, beautifully presented in small boxes for friends, family, or neighbors.
To keep these delightful treats fresh, store them in an airtight container at room temperature for up to 2-3 days. If your kitchen runs warm, or if you prefer a firmer frosting, you can refrigerate them. Just be sure to bring them back to room temperature for about 15-20 minutes before serving to ensure the brownie is soft and the buttercream is creamy. The combination of easy preparation, exquisite flavor, and charming presentation ensures these brownie cups will become a cherished recipe in your baking repertoire.
More Bailey’s Irish Cream Delights
If you’re as enamored with Bailey’s Irish Cream as I am, you’ll be thrilled to discover more ways to incorporate its rich, creamy flavor into your desserts. Here are some of my other favorite recipes that celebrate this beloved liqueur:
Bailey’s Chocolate Chip Bundt Cake (Gluten-Free!) is a surprisingly easy yet elegant dessert that everyone, including those with gluten sensitivities, can joyfully indulge in.
For a refreshingly boozy treat to help you cool off, you absolutely must try this Bailey’s Irish Coffee Shake. It’s like a dessert and a drink all in one!

I always make sure to have a bottle of homemade Bailey’s Hot Fudge Sauce in my refrigerator – it’s perfect for pouring generously over ice cream, enhancing any dessert, or even enjoying by the spoonful!
Elevate your dinner party finale with a Whiskey Skillet Brownie with Bailey’s No-Churn Ice Cream. It’s an effortlessly decadent combination that will leave your guests utterly impressed.
And for a dessert that’s both simple to prepare ahead of time and elegantly delicious, these Bailey’s Chocolate Mousse Brownie Parfaits are a fantastic choice, showcasing layers of rich flavor and texture.

Essential Tools for Baking Success
Having the right tools can make all the difference in your baking endeavors, especially when aiming for perfection. For whipping up that flawlessly smooth and fluffy buttercream frosting, I highly recommend my KitchenAid 7-Quart Pro Line Stand Mixer. It’s an investment that pays off in perfectly textured frostings and batters, saving your arms from the strain of a hand mixer.
For baking the brownie cups themselves, a high-quality muffin tin is crucial. My all-time favorite is the USA Pan Bakeware Cupcake and Muffin Pan. It’s incredibly durable, promises longevity, and most importantly, ensures your brownie cups release effortlessly once baked, preserving their perfect shape.
And if you’re looking to start or upgrade your cake and cupcake decorating skills, a comprehensive starter pack is invaluable. The Wilton 46-Piece Deluxe Cake Decorating Set is an excellent, affordable option that provides all the essentials you need to begin piping beautiful designs. I’ve personally used a similar set for years, and it’s fantastic for achieving those professional-looking finishes.


Espresso Brownie Cups With Bailey’s Buttercream Frosting
equipment
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KitchenAid 7-Quart Pro Line Stand Mixer
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Muffin Pan
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Wilton 46-Piece Deluxe Cake Decorating Set, Cake Decorating Supplies
ingredients
- 1 18 oz box brownie mix plus ingredients called for on the box
- 2 1/2 tsp instant espresso powder
- 1 1/2 tsp Bailey’s Irish Cream Liqueur
- 2 cups powdered sugar
- 1/2 cup unsalted butter
- 3 tsp Bailey’s Irish Cream Liqueur
instructions
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Preheat oven to 350°F (175°C). Lightly grease a 12-cup muffin tin with cooking spray or butter to prevent sticking.
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Prepare the brownie batter according to the instructions on your chosen brownie mix box. Once mixed, gently stir in the instant espresso powder and Bailey’s Irish Cream Liqueur until just combined.
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Divide the enhanced brownie batter evenly among the prepared muffin cups. Bake for approximately 25 minutes, or until a toothpick inserted into the center comes out with moist crumbs.
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Immediately after removing the brownies from the oven, use the bottom of a shot glass or a similar small, round object to gently press an indentation into the center of each warm brownie, forming them into cups.
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Allow the brownie cups to cool completely in the muffin tin before attempting to remove them.
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While the brownie cups are cooling, begin preparing the Bailey’s buttercream frosting. In the bowl of a stand mixer (or using a hand mixer), add the softened unsalted butter. Pour in the Bailey’s Irish Cream Liqueur.
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Beat the butter and Bailey’s together on medium speed until they are thoroughly combined and smooth.
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Gradually add the powdered sugar to the mixture. Start by beating on low speed until the sugar is incorporated, then increase the speed to medium-high. Beat for several minutes until the frosting is light, fluffy, and perfectly creamy. Remember to scrape down the sides of the bowl periodically to ensure even mixing.
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Once the brownie cups are completely cool, transfer the Bailey’s buttercream frosting to a piping bag. Pipe the luscious filling into the center of each brownie cup. If desired, finish with a sprinkle of St. Patrick’s Day themed sprinkles for a festive touch.