Buckeye Brownies

Rich, fudgy brownies topped with a creamy peanut butter layer and smooth chocolate ganache. The ultimate decadent treat for chocolate and peanut butter lovers.

Why This Recipe Works:

• Cooling the brownie base completely prevents the peanut butter fats from separating and turning greasy.
• Using stabilized peanut butter ensures a thick, sliceable fudge layer that holds its shape.
• A splash of heavy cream in the chocolate ganache keeps the top layer soft enough to slice without cracking.

I still remember the sticky, humid July afternoon when my kitchen counter was covered in failed, greasy chocolate squares. I had tried to combine my favorite fudge brownie with a sweet peanut butter paste, but it ended up a separated, oily disaster.

It was incredibly frustrating.

Most recipes for this classic Ohio treat tell you to just slap a standard buttercream-style peanut butter layer onto hot brownies. But when you do that, the residual heat from the baked base melts the butter in the topping, causing the fat to break and leak oil everywhere.

I tested this with four different brands of peanut butter, and the natural, oil-on-top varieties failed every single test because they lack the emulsifiers needed to hold the structure under heat. To fix this, we need to let the brownies cool completely to protect the protein matrix of the peanut butter layer, and we must use a traditional, stabilized peanut butter like Jif or Skippy.

This is hands down the easiest way to get that perfect contrast of rich chocolate and silky peanut butter. If you want more chocolate, check out my Brown Butter Brookies.

Trust me on this one.

Buckeye Brownies

• Publisher Storied Skillet
• Cuisine American
• Category Dessert, Brownies
• Prep Time 20 minutes
• Cook Time 25 minutes
• Servings 16
• Calories 340 calories
• Rating 4.8 4476
• Tags Buckeye Brownies, peanut butter brownies, chocolate ganache, fudgy brownies

Ingredients

• 1/2 cup unsalted butter, melted
• 1 cup granulated sugar
• 1/3 cup Dutch-process cocoa powder
• 1 tsp Diamond Crystal kosher salt (or 1/2 tsp fine table salt)
• 2 large eggs
• 1/2 cup all-purpose flour
• 1 cup creamy peanut butter (stabilized, like Jif or Skippy)
• 1/2 cup powdered sugar
• 3 tbsp unsalted butter, melted (for the topping)
• 1 cup semi-sweet chocolate chips
• 1/4 cup heavy cream

Directions

1. Preheat your oven to 325°F (163°C) and line an 8x8 inch baking pan with parchment paper, leaving an overhang on the sides.
2. In a medium bowl, whisk the melted butter, granulated sugar, cocoa powder, and Diamond Crystal kosher salt until a gritty paste forms.
3. Add the eggs one at a time, whisking vigorously after each addition until the batter becomes shiny, smooth, and pulls away from the sides of the bowl.
4. Gently fold in the all-purpose flour with a spatula just until no flour pockets remain.
5. Spread the batter evenly into the prepared pan and bake for 22 to 25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
6. Remove the brownies from the oven and let them cool completely in the pan on a wire rack.
7. In a clean bowl, beat the creamy peanut butter, powdered sugar, and 3 tablespoons of melted butter until smooth and pliable.
8. Press the peanut butter mixture evenly over the cooled brownie base using your knuckles or the back of a spoon.
9. In a microwave-safe bowl, combine the chocolate chips and heavy cream, heating in 30-second bursts and stirring until completely melted and smooth.
10. Pour the chocolate ganache over the peanut butter layer, spreading it to the edges, then chill in the refrigerator for at least 2 hours before slicing.

Notes

• Salt Conversion: Always use Diamond Crystal kosher salt (1 tsp) for the brownie base. If you only have fine table salt, cut the volume in half (1/2 tsp) to prevent the chocolate from tasting overly salty.
• Peanut Butter Science: Avoid natural, oil-on-top peanut butters for this recipe. The lack of stabilizer fats in natural brands means the peanut butter layer will lose its structural integrity and turn into a greasy, runny mess.
• Temperature Control: Do not rush the cooling process of the brownie base. If you spread the peanut butter mixture onto a warm brownie, the heat will break the emulsion of the butter, leaving a greasy film on top.
• Storage Behavior: After a day in the fridge, the ganache layer will firm up beautifully. For the best texture, let the sliced brownies sit at room temperature for 10 minutes before serving so the peanut butter layer softens slightly.

Serving Suggestions

These rich, layered bars are incredibly decadent on their own, but you can easily turn them into a show-stopping dessert plate with a few simple additions.

• Serve alongside a scoop of No Churn Oreo Ice Cream for the ultimate cookies-and-cream pairing.
• Drizzle with extra warm chocolate ganache right before serving to create a beautiful contrast of temperatures.
• Pair with a cold glass of milk or a hot espresso to cut through the intense richness of the peanut butter.
• Top with a sprinkle of flaky sea salt (like Maldon) to balance the sweetness of the powdered sugar.
• Plate them with fresh raspberries to add a bright, tart contrast to the heavy chocolate.

Storage and Reheating

Keep these brownies stored in an airtight container in the refrigerator. Because of the dairy in the ganache and the soft structure of the peanut butter layer, they will get a tad clumsy and messy if left on the counter on a warm day.

They will easily keep in the fridge for up to a week. In fact, I think they taste even better on day three once the flavors have had time to marry.

Do not microwave them.

If you try to reheat them in the microwave, the ganache and peanut butter layers will liquefy instantly, turning your beautiful bars into a puddle. If you prefer them soft, simply let them sit on the counter for 15 minutes before taking a bite.

You can also freeze them for up to three months by wrapping individual squares tightly in plastic wrap. They actually make a fantastic frozen treat straight out of the freezer.

Ingredient Substitutes

If you need to make some adjustments based on what is in your kitchen, here are the best tested swaps.

1. Peanut Butter Alternative: If you have a peanut allergy, sunflower seed butter (like SunButter) works beautifully as a 1:1 swap, though you may need to add a touch more powdered sugar to hold the shape.
2. Cocoa Powder: You can swap the Dutch-process cocoa powder for natural cocoa powder, but the brownies will have a slightly lighter color and a more fruit-forward chocolate flavor.
3. Heavy Cream: If you don't have heavy cream for the ganache, you can use whole milk, but reduce the amount by half so the glaze doesn't become too runny.
4. Gluten-Free Flour: A high-quality 1:1 gluten-free baking flour (like Bob's Red Mill) can replace the all-purpose flour without affecting the fudgy texture.

I hope these bring a little bit of chocolate-peanut butter joy to your kitchen this week. Let me know in the comments if you managed to let them cool before slicing, or if you, like me, snuck a warm corner piece straight from the pan!