Peanut Butter Stuffed Brownies
If you love rich, fudgy brownies and creamy peanut butter, these Peanut Butter Stuffed Brownies are the ultimate homemade dessert. Each brownie has a thick layer of smooth peanut butter tucked between two layers of intensely chocolatey brownie batter, creating the perfect combination of fudgy chocolate and salty-sweet peanut butter in every bite.
Unlike brownies with peanut butter simply swirled into the top, this recipe gives you a true peanut butter center. The peanut butter is frozen into a solid layer before being placed between the brownie batter, so every square has a generous filling running through the middle.
These brownies are surprisingly simple to make and require only a handful of ingredients. They are perfect for chocolate cravings, bake sales, parties, family gatherings, holiday dessert tables, or anytime you want an impressive homemade treat without making a complicated dessert.
The best part? You can enjoy them warm and gooey, at room temperature for a classic fudgy texture, or chilled from the refrigerator when you want an extra-dense and chewy brownie.
Why Everyone Loves These Peanut Butter Stuffed Brownies
- Rich and fudgy: The chocolate brownie layers stay wonderfully moist and dense rather than becoming cakey.
- Creamy peanut butter center: A thick layer of peanut butter creates a delicious surprise inside every brownie.
- Chocolate and peanut butter combination: Few dessert combinations are as satisfying as rich chocolate paired with creamy peanut butter.
- Perfect for special occasions: These brownies look impressive when sliced, making them ideal for parties and gatherings.
- Easy to prepare: The recipe uses simple ingredients and straightforward techniques.
- Make-ahead friendly: The brownies can be stored for several days, and chilling them makes the texture even fudgier.
- Customizable: You can adjust the amount of peanut butter depending on how rich you want the center to be.
Ingredients Overview
- Creamy conventional peanut butter – This creates the smooth, rich filling. Conventional peanut butter is recommended because natural peanut butter can separate and may not firm up in the same way.
- Unsalted butter – Gives the brownies a rich texture and helps create their soft, fudgy consistency.
- Semisweet baking chocolate – Provides deep chocolate flavor without making the brownies overwhelmingly sweet.
- Granulated sugar – Sweetens the brownie batter while contributing to its chewy, fudgy texture.
- Eggs and egg yolk – Help bind the ingredients together and provide structure while keeping the brownies rich.
- Vanilla extract – Enhances the chocolate and peanut butter flavors.
- All-purpose flour – Provides enough structure to hold the brownies together without making them cakey.
- Unsweetened cocoa powder – Intensifies the chocolate flavor and gives the brownies their deep color.
- Fine sea salt – Balances the sweetness and makes the chocolate and peanut butter flavors stand out.
Using high-quality chocolate and creamy peanut butter can make a noticeable difference in the final flavor.
Variations
- Extra Peanut Butter Brownies – Use the full 1¼ cups of peanut butter for a thick, generous peanut butter center.
- Lighter Peanut Butter Layer – Reduce the peanut butter to 1 cup or even ¾ cup if you prefer a thinner filling.
- Chocolate Peanut Butter Chip Brownies – Add chocolate or peanut butter chips to the brownie batter for even more chocolate-peanut butter flavor.
- Crunchy Peanut Butter Brownies – If you enjoy texture, try using a crunchy conventional peanut butter for small peanut pieces throughout the center.
- Dark Chocolate Brownies – Replace semisweet chocolate with dark chocolate for a deeper, less-sweet chocolate flavor.
- Sea Salt Peanut Butter Brownies – Sprinkle a small amount of flaky sea salt over the brownies after baking for a delicious sweet-and-salty finish.
- Peanut Butter Cup Brownies – Add chopped peanut butter cups to the batter before baking for an extra indulgent dessert.
How to Make Peanut Butter Stuffed Brownies
1. Prepare the Peanut Butter Filling
Start by placing the creamy peanut butter in a microwave-safe or heat-safe bowl.
Microwave it for approximately 20–30 seconds, just until the peanut butter becomes soft and pourable. It should be easy to spread but should not become very hot.
Line an 8-inch square metal pan with parchment paper, leaving some parchment hanging over the sides. This overhang will make it easier to remove the frozen peanut butter layer later.
Pour the peanut butter into the prepared pan and spread it into an even layer.
Place the pan in the freezer for approximately 1 hour, or until the peanut butter is completely firm.
Once frozen, use the parchment paper to lift the peanut butter sheet from the pan. Keep the peanut butter layer frozen while you prepare the brownie batter.
2. Prepare the Brownie Pan
Preheat your oven to 350°F (175°C).
Line the same 8-inch square pan with fresh parchment paper, again leaving an overhang on the sides.
The parchment makes removing the finished brownies much easier and helps prevent the peanut butter filling from sticking to the pan.
3. Melt the Chocolate and Butter
In a large microwave-safe bowl, combine the unsalted butter and chopped semisweet baking chocolate.
Microwave in 30-second intervals, stirring well between each interval.
Continue until the butter and chocolate are completely melted and smooth.
Be careful not to overheat the chocolate. Short microwave intervals and frequent stirring help prevent burning.
4. Add the Sugar
Add the granulated sugar to the warm butter and chocolate mixture.
Whisk vigorously until everything is well combined.
Allow the mixture to cool slightly until it is just barely warm.
This step is important because you don’t want the mixture to be extremely hot when you add the eggs.
5. Add the Eggs and Vanilla
Add the two eggs, one additional egg yolk, and vanilla extract.
Whisk the mixture for approximately 1 minute, or until it becomes smooth and well combined.
The extra egg yolk contributes richness and helps give these brownies their wonderfully fudgy texture.
6. Add the Dry Ingredients
Use a rubber spatula to gently stir in the all-purpose flour, sifted cocoa powder, and fine sea salt.
Mix only until the ingredients are incorporated.
Avoid overmixing at this stage. Too much mixing can develop the gluten in the flour and result in brownies that are less tender and fudgy.
7. Assemble the Brownies
Pour approximately half of the brownie batter into the parchment-lined pan.
Use a spatula to spread it into an even layer.
Carefully remove the frozen peanut butter sheet from the freezer and place it directly on top of the brownie batter.
Try to center the peanut butter layer as evenly as possible.
Pour the remaining brownie batter over the peanut butter layer.
Spread it carefully with a spatula so the peanut butter is completely covered.
This creates the signature three-layer structure: brownie, peanut butter, brownie.
8. Bake
Place the pan in the preheated oven and bake for approximately 30 minutes.
The brownies should look set around the edges while the center remains slightly soft and fudgy.
A toothpick doesn’t necessarily need to come out completely clean. These are meant to be rich and fudgy, so a few moist crumbs are perfectly fine.
Be careful not to overbake them because too much time in the oven can make the brownie layers dry.
9. Cool Before Slicing
Allow the brownies to cool in the pan for approximately 30 minutes.
Then use the parchment overhang to carefully lift the brownies from the pan.
Allow them to cool for another 30 minutes before slicing.
For the cleanest cuts, use a sharp knife and wipe it between slices.
If you prefer an especially dense and fudgy texture, place the brownies in the refrigerator before serving.
Pro Tips & Cooking Secrets
Freeze the peanut butter completely. The peanut butter layer needs to be firm enough to lift and place over the first brownie layer. If it is still soft, it can spread into the batter.
Don’t overmix the brownie batter. Once the flour and cocoa powder are added, stir just until combined. This helps maintain the soft, fudgy texture.
Avoid overbaking. The brownies should remain slightly gooey in the center when they come out of the oven. They will continue to set as they cool.
Chill for extra-fudgy brownies. These brownies become especially dense and rich when refrigerated. Chilled brownies are also easier to slice neatly.
Serving Suggestions
- Serve a warm brownie with a scoop of vanilla ice cream for an irresistible chocolate and peanut butter dessert.
- Drizzle the brownies with melted chocolate or warm peanut butter before serving.
- Sprinkle a little flaky sea salt over the top to balance the sweetness.
- Serve chilled with a cold glass of milk for a classic, comforting dessert combination.
How to Store Peanut Butter Stuffed Brownies
Allow the brownies to cool completely before storing them.
Place them in an airtight container and keep them at room temperature for up to 3 days.
For longer storage, place the brownies in an airtight container and refrigerate them for up to 5 days.
Refrigerated brownies become particularly dense and fudgy, making them a great choice if you enjoy a chewy, chilled brownie texture.
If stacking the brownies, place parchment paper between the layers to prevent them from sticking together.
Can You Freeze Peanut Butter Stuffed Brownies?
Yes, these brownies can be frozen.
Allow them to cool completely, then cut them into individual squares. Wrap each brownie tightly in plastic wrap and place the wrapped brownies inside a freezer-safe container or bag.
Freeze for up to 2–3 months for the best quality.
When you’re ready to eat them, thaw the brownies in the refrigerator overnight or allow them to come to room temperature.
How to Get Clean Brownie Slices
For bakery-style brownie squares, allow the brownies to cool completely before cutting.
Use a sharp knife and wipe it clean between each cut. If the brownies are chilled, the peanut butter center will be firmer, which can make slicing easier.
You can also slightly warm the knife before making each cut for exceptionally clean edges.
Peanut Butter Stuffed Brownies FAQs
Can I use natural peanut butter?
It is better to use conventional creamy peanut butter for this recipe. Natural peanut butter can separate because of its oil content, which may make the filling more difficult to freeze and handle.
Can I use less peanut butter?
Absolutely. The original recipe uses 1¼ cups, but you can reduce the amount to 1 cup or ¾ cup if you prefer a thinner peanut butter filling.
Why does the peanut butter need to be frozen?
Freezing turns the peanut butter into a firm sheet that can be placed between the two layers of brownie batter. Without freezing, the peanut butter may blend into the batter instead of remaining as a distinct center layer.
How do I know when the brownies are done?
The edges should look set while the center can remain slightly soft. A toothpick inserted into the brownie should have moist crumbs rather than completely wet batter. Avoid baking until the toothpick is completely dry, as this can result in overbaked brownies.
Can I make these brownies in a larger pan?
Yes. The recipe can be doubled and prepared in a 9×13-inch pan. The baking time can remain approximately the same, but begin checking the brownies toward the end of the recommended baking time because ovens and pans can vary.
Should I serve these brownies warm or cold?
Both options are delicious. Warm brownies have a softer, gooier texture, while refrigerated brownies become extra fudgy and dense. For the cleanest slices, chilling is recommended.
Can I add chocolate chips?
Yes. Chocolate chips, peanut butter chips, or chopped chocolate can be added to the brownie batter for an even richer dessert.
Peanut Butter Stuffed Brownies
Equipment
- heat-safe bowl
- microwave
- metal 8-inch square pan
- large microwave-safe bowl
- rubber spatula
- parchment paper
Ingredients
- 1 1/4 cups creamy conventional peanut butter (NOT ‘natural’)
- 10 tablespoons unsalted butter
- 4 ounces semisweet baking chocolate, chopped
- 1 cup granulated sugar
- 2 large eggs plus 1 egg yolk
- 1 teaspoon vanilla extract
- 1/2 cup all-purpose flour
- 1/4 cup unsweetened cocoa powder, sifted
- 1/4 teaspoon fine sea salt
Instructions
- Place the peanut butter in a heat-safe bowl and microwave for 20 to 30 seconds, or until pourable but not super hot.Line a metal 8-inch square pan with parchment paper, leaving an overhang. Spread the peanut butter into an even layer in the pan. Freeze for 1 hour or until solidified. Use the parchment to remove from pan and return peanut butter sheet to freezer. Keep frozen while making the brownie batter.
- Preheat oven to 350°F. Line the square pan again with parchment paper, leaving an overhang.
- In a large microwave-safe bowl, combine the butter and chocolate. Microwave in 30-second bursts, stirring between each burst, until the mixture is melted and smooth. Add the sugar to the hot butter mixture and whisk vigorously until combined. Allow to cool until just barely warm.
- Add in eggs, yolk, and vanilla extract and whisk for about 1 minute, or until very well combined.
- Use a rubber spatula to stir in flour, cocoa powder, and salt until just combined.
- Pour half of the batter into prepared pan and smooth out. Carefully place the frozen peanut butter sheet over the batter. Pour remaining batter on top, covering completely.
- Bake in the preheated oven for about 30 minutes, or until cooked through but still very slightly gooey in the center. Let cool in pan 30 minutes. Remove from pan and allow to cool for another 30 minutes before slicing and serving.
- Brownies can be stored in an airtight container at room temperature for up to 3 days or in the fridge for up to 5 days. Serving chilled makes the brownies extra fudgy!
