If you’re looking for the ultimate St. Patrick’s Day dessert, these Chocolate Stout Cupcakes are about to become your new tradition.
I’ve been making these cupcakes for St. Paddy’s parties for about 15 years now! They’re a staple part of my friend’s annual party now. I’ve tweaked the recipe slightly over the years (and, let’s be honest, added more booze) and they’re always a huge hit (with the adults only – no kids allowed with the whiskey + Irish Cream!).
The cupcakes are deeply chocolatey, incredibly moist, and extra delicious thanks to plenty of stout. Think rich, decadent chocolate cake! Then they’re made even more decadent with a whisky-spiked chocolate ganache center and a swirl of Irish Cream Buttercream on top.
They’re rich but balanced, chocolatey but not heavy, and festive without being too gimmicky—basically everything you want in a St. Patrick’s Day dessert recipe. Just make sure they’re served to adults only 😉
Sláinte! ☘️
The Cupcake Lineup (aka Your St. Patrick’s Day Dessert Dream Team)
You can absolutely make these cupcakes without a filling, and top them with whatever buttercream you prefer – but the way I prefer them, especially for St. Paddy’s Day, make them a little extra in the best way:
- Chocolate Stout Cupcake: Deep chocolate flavor, super moist crumb.
- Whisky Chocolate Ganache Center: A surprise molten middle that makes the cupcakes feel bakery-level fancy.
- Irish Cream Buttercream: I use my Swiss Meringue Buttercream spiked with plenty of Irish Cream. Silky, not-too-sweet, and lightly Irish cream flavored. Magic!
Why Stout Works So Well in Chocolate Cake
Chocolate and stout are secretly best friends. Stouts are brewed with roasted barley, which creates deep, coffee-like, slightly bitter notes. Those flavors amplify cocoa in the same way espresso powder does in chocolate desserts. Here, the stout does a few things:
- Enhances chocolate flavor without tasting overly boozy
- Adds moisture for a tender crumb
- Balances sweetness with its roasted bitterness
What Type of Stout Should I Use?
Guinness is the classic choice because it’s smooth and creamy, but honestly, any stout you enjoy drinking will work here. Most recently, I used a Dogfish Head Affogato Stout because it was what I had on hand, and it worked perfectly.
Baking Science Moment: How to Make Perfect Cupcakes
Cake baking is where precision matters most. A few small details make a huge difference in the final texture.
Measure Carefully (This Is Huge)
Unlike cookies, cupcakes are sensitive to small ratio changes.
Too much flour = dry, dense cupcakes
Too little flour = sunken cupcakes
If possible, use a kitchen scale. It’s the very best way to bake so you ensure precision and consistency every time – plus, fewer dishes, so it’s a win-win.
If you’re measuring with cups, lightly spoon flour into the cup and level it off—don’t scoop directly from the bag as that can compact extra unwanted flour, causing dry cupcakes.
Don’t Reduce the Sugar
It’s tempting, but resist the urge. Sugar doesn’t just sweeten cupcakes—it also:
- Keeps them moist
- Helps create a tender crumb
- Contributes to structure and browning
Reducing it can lead to dry, tough cupcakes that stale very quickly. Trust the recipe.
The Magic of Sour Cream in Cakes and Cupcakes
Sour cream is the quiet MVP of these cupcakes., adding:
- Fat for richness
- Acidity to tenderize the crumb + activate the baking soda
- Moisture without thinning the batter
The result is cupcakes that stay soft for days instead of drying out.
Don’t Overbake!
This is the number one cupcake killer. Bake just until a toothpick comes out with just a few moist crumbs.
Remember: cupcakes keep cooking slightly after they leave the oven.
Filling the Cupcakes with Whisky Chocolate Ganache
Once the cupcakes cool, it’s time for the fun part! It’s entirely optional, but it makes these treats so special.
Use a cupcake corer, apple corer, or even a large round piping tip to remove the center of each cupcake. Fill with whisky-spiked chocolate ganache.
The combo of chocolate cake, silky boozy ganache, and Irish Cream buttercream is honestly ridiculous in the best way.
The Irish Cream Buttercream
Instead of overly sweet American buttercream, these cupcakes shine with Irish Cream-Spiked Swiss Meringue Buttercream.
It’s silky-smooth, light and creamy, and just boozy enough to take these cupcakes over the top.
Pipe a tall swirl and you’ve got the ultimate St. Patrick’s Day cupcake.
Kiersten’s Tips for the Best Chocolate Stout Cupcakes
- Use room temperature eggs and sour cream for smooth batter.
- Choose a good-quality stout. Guinness is classic, but any stout will work well (though I don’t recommend using a flavored stout).
- Use a high-quality cocoa powder for the richest chocolate flavor.
- Let cupcakes cool completely before filling and frosting.
How to Make Chocolate Stout Cupcakes Ahead of Time
Store unfrosted cupcakes inside an airtight container in the fridge. Filled and frosted cupcakes can also be stored inside an airtight container in the fridge. I like to use an upside-down airtight container, placing the iced cupcakes on the lid, so the frosting stays intact. Cupcakes will stay moist and fresh for 3 days.
More St. Patrick’s Day Treats:
Chocolate Stout Cupcakes
Ingredients
For the Cupcakes:
- 1 cup (250 grams) stout, Guinness preferred but any stout will work
- 1 cup (226 grams) unsalted butter, cubed
- ¾ cup (75 grams) cocoa powder, any kind
- 2 large eggs + 1 additional egg yolk, at room temperature
- 2/3 cup (150 grams) sour cream, at room temperature
- 1 tablespoon vanilla extract
- 2 cups (260 grams) all-purpose flour, measured accurately
- 2 cups (400 grams) granulated sugar
- 1½ teaspoons baking soda
- ¾ teaspoons salt
For the Whiskey-Spiked Ganache (optional):
- 8 ounces (227 grams) bittersweet chocolate, chopped
- ½ cup (120 grams) heavy cream
- 1 Tablespoon (14 grams) butter
- 1 Tablespoon Irish whiskey, or more to taste
Instructions
Make the Cupcakes:
- Preheat oven to 350°F / 175°C. Line 24 cupcake cups with liners.
- In a medium saucepan, place the stout and butter. Over medium heat, bring to a simmer. Remove from heat. Add the cocoa powder and whisk until smooth. Set aside to cool to lukewarm.
- In a large bowl, place the eggs, egg yolk, sour cream, and vanilla extract. Whisk until combined and completely smooth.
- Add the cooled stout mixture to the egg mixture and whisk well to combine.
- Add the flour, sugar, baking soda, and salt. Whisk until almost combined. Switch to a rubber spatula and finish combining, ensuring you scrape down the sides and bottom of the bowl. Do not overmix.
- Using a large cookie scoop, divide the batter among the cupcake liners, being careful not to overfill (this can cause sunken cupcakes). I like to fill my cupcakes about 2/3 full.
- Bake until a tester inserted into the center comes out with just a few moist crumbs – about 13-16 minutes. Transfer the cupcakes to a wire rack to cool completely.
Make the Ganache (if using):
- Place the chopped chocolate and butter in a medium bowl. In a separate medium microwave-safe bowl, place the heavy cream. Heat until the cream just begins to simmer. Pour the hot cream over the chopped chocolate and butter. Allow to sit for a few minutes to soften the chocolate, then carefully whisk until combined, smooth, and glossy.
- Add the whiskey 1/2 a teaspoon at a time, stirring well to combine after each addition. I like about 2 Tablespoons total, for a boozy ganache – but add less if you prefer it a little more subtle. Note that as the ganache sits, the alcohol flavor will increase.
Assemble:
- Using a cupcake corer, apple corer, or even a large round piping tip, carefully remove a piece of the middle of each cupcake. Pipe the ganache to fill each cavity, so the the ganache is flush with the top of each cupcake.
- Pipe your desired buttercream on top of each cupcake (more on this in the Notes section below). Decorate with festive sprinkles and/or a drizzle of ganache.
- Serve, or store refrigerated, inside an upside-down airtight container (to prevent ruining the frosting) for up to 2 days. Set at room temperature an hour before serving.
