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Buckeye Brownies

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close up shot of a plate of chocolate and peanut butter brownies
These buckeye brownies are the perfect combination of chocolate and peanut butter goodness.
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Table of Contents
  1. Buckeye Brownies Ingredients
  2. How to Make This Buckeye Brownies Recipe
  3. How To Serve
  4. Storage
  5. More Recipes You’ll Love
  6. JUMP TO RECIPE

Decadent buckeye brownies are a heavenly mix of two classic treats that are fudgy, chocolatey and have a peanut butter filling that will leave you wanting more. If you’re looking for a show-stopping dessert to impress your friends and family, look no further than this rich brownie recipe.

close up shot of a plate of chocolate and peanut butter brownies

Buckeye Brownies Ingredients

Buckeye Brownies raw ingredients that are labeled

You’ll need:

For the Brownie Base

  • 1 (18.3-ounce) boxed brownie mix
  • ½ cup vegetable oil
  • 2 large eggs, room temperature and beaten
  • 3 tablespoons water

For the Peanut Butter Layer

  • 2 cups creamy peanut butter
  • 8 tablespoons salted sweet cream butter, room temperature 
  • 2 teaspoons pure vanilla extract 
  • 3 cups powdered sugar

For the Chocolate Ganache

  • 1 (12-ounce) package semi-sweet chocolate chips
  • ¼ cup heavy cream 

SUBSTITUTIONS AND ADDITIONS

BROWNIES: You can use any variety of brownie base for these fudgy brownies. 

CHOCOLATE CHIPS: You can substitute milk chocolate chips or dark chocolate chips in the ganache. 

PEANUT BUTTER: You can substitute crunchy peanut butter for creamy peanut butter in this great recipe.

How to Make This Buckeye Brownies Recipe

For the Brownie Base

STEP ONE: Preheat the oven to 350°F. Line a 9 x 13-inch baking dish with parchment paper. Lightly spray the lined baking dish with baking spray (Baker’s Joy or a generic version). Set it aside.

STEP TWO: Add the box of brownie mix, oil, eggs, and water to a medium bowl. Stir just until combined.

brownie mix, oil, eggs, and water combined in a bowl

STEP THREE: Evenly spread the brownie batter in the prepared baking dish. Bake for 20 minutes. Allow the brownies to cool completely.

brownie batter placed in a prepared baking dish

For the Peanut Butter Layer

STEP ONE: Using either a stand mixer or a large bowl and a hand mixer on medium-high speed, beat the butter for 1 minute, or until smooth.

butter blended in a bowl

STEP TWO: Add the peanut butter and vanilla, continue mixing on medium-high until the mixture is thoroughly combined and smooth.

peanut butter and vanilla blended into the butter in a bowl

STEP THREE: Lower the mixer speed to medium-low. Add the powdered sugar 1 cup at a time, mixing well after each cup until well incorporated and smooth.

powdered sugar blended into the peanut butter mixture in a bowl

STEP FOUR: Once the brownie layer is completely cooled, evenly spread the peanut butter mixture over the brownie layer.

OUR RECIPE DEVELOPER SAYS

When spreading and smoothing the peanut butter mixture over the cooled brownies, you can place a piece of wax paper to help smooth the mixture.

peanut butter mixture spread over the brownie layer in a baking dish

For the Chocolate Ganache

STEP ONE: Add the chocolate chips and the heavy cream to a microwave-safe bowl. Heat in the microwave for 45 seconds. Stir and continue heating in 15-second intervals until the ganache is completely smooth.

chocolate chips and cream combined in a bowl

STEP TWO: Using either a silicone spatula or an offset spatula, spread the ganache in an even layer over top of the peanut butter mixture. 

chocolate ganache spread over the peanut butter layer in a baking dish

STEP THREE: Cover the brownies and chill in the refrigerator for 15 to 20 minutes. Remove the brownies from the refrigerator.

Slice 15 (2½-inch x 3-inch) pieces, return the covered brownies to the refrigerator to chill for an additional 1 hour and 45 minutes. 

PRO TIP:

You can let the brownies chill for the full 2 hours before slicing, but the chocolate layer may crack and not be as pretty as pre-slicing after chilling for 15 to 20 minutes.

chilled brownies sliced in a baking dish

STEP FOUR: Remove the brownies from the baking dish by the parchment paper. 

PRO TIP:

You may need to carefully re-slice the brownies before serving.

sliced brownies removed from the baking dish and placed on a wooden board

How To Serve

Any peanut butter lover will love this rich peanut butter dessert. Add a scoop of vanilla ice cream and whipped cream on top for an extra decadent treat.

These would be just the right choice to add to the menu if you are cheering on your favorite Ohio team on game day.

Our buckeyes candies and buckeye brownie cookies are two more peanut butter and chocolate treats to add to your cookie jar.

Storage

ON THE COUNTER: Store any leftovers of these peanut butter brownies in an airtight container for up to 7 days at room temperature. 

IN THE FREEZER: You can freeze the buckeye brownies for up to 1 month. Allow the brownies to thaw overnight in the refrigerator before serving.

overhead shot of chocolate and peanut butter brownies on a wooden board

A rich chocolate ganache covers a creamy peanut butter filling that is layered on top of decadent brownies for an incredible brownie recipe that will be a hit with peanut butter and chocolate fans alike.

FREQUENTLY ASKED QUESTIONS

Why are these called buckeyes?

This confection is called a buckeye because the finished product with its chocolate topping and a layer of peanut butter in the middle resembles the buckeye nut from the buckeye tree which is native to Ohio.

Can I freeze these brownies?

This buckeye brownie recipe can be frozen for up to one month in an airtight container.

Can I use homemade brownies instead of a boxed brownie mix?

If you have a favorite brownie recipe, you can use it instead of boxed brownie mix for these rich chocolate brownies.

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close up shot of a plate of chocolate and peanut butter brownies

Buckeye Brownies

5 from 1 vote
These buckeye brownies are the perfect combination of chocolate and peanut butter goodness.
Prep Time 15 minutes
Cook Time 25 minutes
Total Time 2 hours 40 minutes
Servings 15 slices

Ingredients
  

Brownie Base

  • 18.3 ounces brownie mix
  • ½ cup vegetable oil
  • 2 large eggs, room temperature and beaten
  • 3 tablespoons water

Peanut Butter Layer

  • 2 cups creamy peanut butter
  • 8 tablespoons salted sweet cream butter, room temperature
  • 2 teaspoons pure vanilla extract
  • 3 cups powdered sugar

Chocolate Ganache

  • 12 ounces semi-sweet chocolate chips
  • ¼ cup heavy cream

Instructions
 

Brownie Base

  • Preheat the oven to 350°F. Line a 9×13-inch baking dish with parchment paper. Lightly spray the lined baking dish with baking spray (Baker’s Joy or a generic version). Set it aside.
  • Add the brownie mix, oil, eggs, and water to a medium-sized mixing bowl. Stir just until combined.
  • Evenly spread the brownie batter in the prepared baking dish. Bake for 20 minutes. Allow the brownies to cool completely.

Peanut Butter Layer

  • Using either a stand mixer or a large mixing bowl and a handheld mixer on medium-high speed, beat the butter for 1 minute, or until smooth.
  • Add the peanut butter and vanilla, continue mixing on medium-high until the mixture is completely combined and smooth.
  • Lower the mixer speed to medium-low. Add the powdered sugar 1 cup at a time, mixing well after each cup until well incorporated and smooth.
  • Once the brownie layer is completely cooled, evenly spread the peanut butter mixture over the brownie layer.

Chocolate Ganache

  • Add the chocolate chips and the heavy cream to a microwave-safe bowl. Heat in the microwave for 45 seconds. Stir and continue heating in 15-second intervals until the ganache is completely smooth.
  • Using either a silicone spatula or an offset spatula, evenly spread the ganache over the peanut butter layer.
  • Cover the brownies and chill in the refrigerator for 15 to 20 minutes. Remove the brownies from the refrigerator. Slice 15 slices (2½ inches x 3 inches), return the covered brownies to the refrigerator to chill for an additional 1 hour 45 minutes.
  • Remove the brownies from the baking dish by the parchment paper. You may need to carefully re-slice the brownies before serving.

Notes

  • When spreading and smoothing the peanut butter mixture over the cooled brownies, you can place a piece of wax paper to help smooth the mixture.
  • You can let the brownies chill for the full 2 hours before slicing, but the chocolate layer may crack and not be as pretty as pre-slicing after chilling for 15 to 20 minutes.
  • You may need to carefully re-slice the brownies before serving.

Nutrition

Sodium: 310mg | Calcium: 39mg | Vitamin C: 1mg | Vitamin A: 292IU | Sugar: 53g | Fiber: 3g | Potassium: 339mg | Cholesterol: 47mg | Calories: 661kcal | Trans Fat: 1g | Monounsaturated Fat: 16g | Polyunsaturated Fat: 5g | Saturated Fat: 14g | Fat: 39g | Protein: 12g | Carbohydrates: 71g | Iron: 3mg
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