Peanut Butter Brownie Cake is the ultimate dessert mashup—rich, fudgy brownies transformed into a soft cake layered or topped with creamy peanut butter goodness. It’s dense like a brownie, moist like a cake, and packed with that irresistible chocolate–peanut butter combination.
Perfect for birthdays, celebrations, or serious chocolate cravings, this dessert delivers intense flavor and indulgent texture in every bite.
Why You’ll Love This Recipe
This cake stands out because:
• Deep, fudgy chocolate flavor
• Creamy peanut butter layers
• Soft yet dense brownie texture
• Perfect balance of sweet and salty
• Great for special occasions
It’s like a brownie and peanut butter frosting had a delicious upgrade.
Preparation Time
Prep Time: 20 minutes
Bake Time: 30–35 minutes
Cooling Time: 1 hour
Total Time: About 2 hours
Servings: 10–12 slices
Ingredients
For the Brownie Cake
1 cup unsalted butter (melted)
1½ cups granulated sugar
¾ cup brown sugar
3 large eggs
1 tablespoon vanilla extract
1 cup all-purpose flour
¾ cup cocoa powder
½ teaspoon salt
1 teaspoon baking powder
½ cup milk
1 cup chocolate chips
For the Peanut Butter Frosting
1 cup creamy peanut butter
½ cup unsalted butter (softened)
2 cups powdered sugar
¼ cup heavy cream
1 teaspoon vanilla extract
Optional Topping
Chocolate ganache
Peanut butter drizzle
Chocolate chips
Chopped peanuts
Kitchen Tools Needed
Mixing bowls
Electric mixer
9-inch cake pan or 9×13 pan
Spatula
Cooling rack
Step-by-Step Instructions
Step 1: Preheat the Oven
Preheat oven to 350°F (175°C).
Grease and line your baking pan.
Step 2: Make the Brownie Batter
In a large bowl, whisk together:
• melted butter
• granulated sugar
• brown sugar
Add:
• eggs
• vanilla
Mix until smooth.
Step 3: Add Dry Ingredients
In another bowl, mix:
• flour
• cocoa powder
• salt
• baking powder
Gradually add to the wet mixture.
Stir in milk and chocolate chips.
Step 4: Bake
Pour batter into prepared pan.
Bake for 30–35 minutes until set but still slightly fudgy in the center.
Let cool completely.
Step 5: Make Peanut Butter Frosting
Beat together:
• peanut butter
• softened butter
Until creamy.
Add:
• powdered sugar
• heavy cream
• vanilla
Mix until smooth and fluffy.
Step 6: Assemble
Spread the peanut butter frosting evenly over the cooled brownie cake.
Step 7: Add Toppings
Drizzle with chocolate ganache or melted peanut butter.
Sprinkle chocolate chips or chopped peanuts if desired.
Estimated Calories
Per slice (approximate):
Calories: 450–550
Fat: 28g
Carbohydrates: 50g
Sugar: 35g
Protein: 8g
Expert Tips for Best Results
Don’t Overbake
Keep the center slightly fudgy for the best texture.
Use Quality Cocoa Powder
This enhances the chocolate flavor.
Cool Completely Before Frosting
Warm cake will melt the frosting.
Adjust Frosting Consistency
Add more cream for a softer frosting or more sugar for a thicker one.
Delicious Variations
Layered Peanut Butter Brownie Cake
Slice cake in half and add frosting between layers.
Peanut Butter Cup Version
Add chopped peanut butter cups into the batter.
Salted Version
Sprinkle sea salt on top for contrast.
Swirled Peanut Butter Brownie Cake
Swirl peanut butter into the batter before baking.
Storage Instructions
Room Temperature
Store in an airtight container for 2–3 days.
Refrigerator
Store for up to 5 days.
Freezing
Freeze slices for up to 2 months.
Perfect Occasions
This cake is perfect for:
• birthdays
• celebrations
• chocolate lovers
• holidays
• dessert tables
Final Thoughts
Peanut Butter Brownie Cake is a rich, indulgent dessert that combines fudgy brownie texture with creamy peanut butter frosting. It’s easy to make, incredibly satisfying, and perfect for anyone who loves chocolate and peanut butter.
Once you try it, this cake will quickly become a favorite go-to dessert for any special occasion or sweet craving.