🍺🍫Guinness Chocolate Sheet Cake with Guinness Cream Cheese Frosting 🍺🍫
Deep, dark, and irresistibly moist, this Guinness Chocolate Sheet Cake is packed with rich cocoa flavor and enhanced by the bold depth of stout beer. Topped with a silky Guinness cream cheese frosting, this cake is the ultimate Irish-inspired dessert — perfect for St. Patrick’s Day or any chocolate lover’s celebration.
Why You’ll Love This Cake 🍺🍫
- Incredibly moist texture
- Deep, complex chocolate flavor
- Not “beer-y” — just rich and balanced
- Easy sheet cake (no stacking layers!)
- Perfect for feeding a crowd
- Stunning dark color with creamy frosting contrast
Does Guinness Really Work in Cake?
Yes — and beautifully.
Guinness:
- Enhances cocoa flavor
- Adds moisture
- Balances sweetness
- Creates depth
It does not taste like beer. It simply makes the chocolate richer and more sophisticated.
Ingredients
For the Cake
- 1 cup Guinness stout
- ½ cup unsalted butter
- ½ cup vegetable oil
- ¾ cup unsweetened cocoa powder
- 2 cups granulated sugar
- 2 large eggs
- ½ cup sour cream
- 1 teaspoon vanilla extract
- 2 cups all-purpose flour
- 1 ½ teaspoons baking soda
- ½ teaspoon salt
For the Guinness Cream Cheese Frosting
- 8 oz cream cheese, softened
- ½ cup unsalted butter, softened
- 3 ½ cups powdered sugar
- 2–3 tablespoons Guinness reduction (see below)
- 1 teaspoon vanilla extract
- Pinch of salt
- Measuring cups / spoons
- 9×13 baking pan
- Sauce pan
- Spoon
- Whisk
- Large bowl
- Bowl
- Electric mixer
- Gold sprinkles (optional)
- Mini shamrock sprinkles (optional)
Important: Reduce the Guinness for the Frosting
Pour about ½ cup Guinness into a small saucepan.
Simmer gently for 8–10 minutes until reduced to about 3 tablespoons.
Cool completely before adding to frosting.
This keeps the frosting flavorful without being watery.
Instructions
Step 1: Prepare the Pan
Preheat oven to 350°F.
Grease a 9×13-inch baking pan and line with parchment if desired.
Step 2: Make the Chocolate Base
In a saucepan over medium heat, combine:
- Guinness
- Butter
- Oil
- Cocoa powder
Whisk until melted and smooth. Remove from heat and let cool slightly.
Step 3: Mix Wet Ingredients
In a large bowl, whisk together:
- Sugar
- Eggs
- Sour cream
- Vanilla
Slowly pour in the cooled chocolate mixture and whisk until combined.
Step 4: Add Dry Ingredients
In a separate bowl, whisk together:
- Flour
- Baking soda
- Salt
Gradually add to the wet ingredients and mix just until combined. Do not overmix.
Step 5: Bake
Pour batter into prepared pan.
Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean.
Cool completely before frosting.
Make the Guinness Cream Cheese Frosting
Beat cream cheese and butter until smooth and fluffy (2–3 minutes).
Add powdered sugar gradually. Mix until smooth.
Add:
- 2 tablespoons cooled Guinness reduction
- Vanilla
- Pinch of salt
Beat until creamy and silky. Adjust with more reduction if desired.
Spread over completely cooled cake.
Optional Garnishes
- Chocolate shavings
- Cocoa dusting
- Gold sprinkles (St. Patrick’s Day sparkle ✨)
- Mini shamrock sprinkles
- Dark chocolate drizzle
Storage
Store covered in the refrigerator for up to 4 days.
Bring to room temperature before serving for best texture.
Recipe Card
Guinness Chocolate Sheet Cake with Guinness Cream Cheese Frosting
Prep Time: 20 minutes
Bake Time: 35 minutes
Total Time: 55 minutes
Serves: 12–16
(Ingredients and instructions as listed above.)
If you make this Guinness Chocolate Sheet Cake, I would absolutely love to hear what you think! 🍀🍫 Leave a comment below and let me know if you added extra chocolate drizzle or festive sprinkles. And don’t forget to save this recipe to Pinterest for your St. Patrick’s Day celebration!
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