Name: Peanut Butter Stuffed Brownies Recipe
Prep time: 20 min
Cook time: 32 min
Total time: 3 h 52 min
Cuisine: American
Ingredients: 1 cup (250g) smooth peanut butter spread; 1/2 tsp salt flakes, divided; 200g / 14 tbsp unsalted butter (1 3/4 US sticks); 1 1/4 cups (200g) dark chocolate chips (7 oz); 1 cup loosely packed brown sugar; 3 large eggs, lightly beaten; 1 tsp vanilla extract; 1/2 cup plain flour; 1/4 cup cocoa powder; 1/8 tsp cooking salt / kosher salt; 2 tbsp peanut butter (reserved from the 1 cup)

Print Recipe· 4.2 from 11 reviews

If you have a love for chocolate and peanut butter, you are going to fall head over heels for this Peanut Butter Stuffed Brownies Recipe. Imagine biting into fudgy, rich brownies with a luscious, creamy peanut butter center that melts in your mouth, creating an irresistible combination of flavors and textures. This recipe takes classic brownies up a notch by hiding a smooth peanut butter slab inside, with delicate swirls on top that add a beautiful touch and extra bursts of nutty goodness. Whether you’re making this for a special occasion or just because life calls for a decadent treat, these brownies promise to bring a smile to everyone lucky enough to enjoy them.

Ingredients You’ll Need

The image shows ingredients for baking arranged neatly on a white marbled surface. There are three brown eggs placed together in the top left corner. Below and slightly to the right is a small white bowl filled with dark brown chocolate chips. To the left of that bowl is a small clear bowl holding white flour. Above the flour and chocolate chips bowls is another small clear bowl filled with brown sugar. Towards the bottom right is a small clear bowl with light yellow butter cut into cubes. At the top right of the image, there is a small clear bowl holding golden vanilla liquid, next to it are two small black labels marked “vanilla” and “salt.” Below these is a small dark brown bowl filled with cocoa powder with the label “cocoa powder” next to it. The whole setting is on a smooth white marble texture background. Photo taken with an iphone --ar 4:5 --v 7

The magic of this Peanut Butter Stuffed Brownies Recipe starts with simple yet essential ingredients. Each element plays its part in creating that perfect balance of fudgy texture, rich chocolate flavor, and creamy peanut butter delight that makes these brownies stand out.

1 cup (250g) smooth peanut butter spread: The star filling and swirls that bring creamy richness and a delightful nutty layer.
1 tsp salt flakes, divided: Enhances the flavor by cutting through sweetness and amplifying the chocolate and peanut butter.
200g / 14 tbsp unsalted butter: Adds moisture and richness, ensuring a smooth, melt-in-your-mouth texture.
1 1/4 cups (200g) dark chocolate chips: Provides deep chocolate flavor and a glossy finish once melted.
1 cup loosely packed brown sugar: Brings a subtle caramel note and helps keep the brownies moist.
3 large eggs, lightly beaten: Gives structure and contributes to the fudgy consistency.
1 tsp vanilla extract: Adds warmth and complements the chocolate and peanut butter beautifully.
1/2 cup plain flour: The base dry ingredient that holds everything together without compromising softness.
1/4 cup cocoa powder: Intensifies the chocolate flavor and darkens the batter to a rich, inviting shade.
1/8 tsp cooking salt / kosher salt: Balances sweetness and enhances overall flavor depth.

How to Make Peanut Butter Stuffed Brownies Recipe

Step 1: Prepare the Peanut Butter Slab

Start by saving 2 tablespoons of peanut butter for the swirling effect on top. Warm the rest in the microwave just enough to loosen it, then spread it evenly in a lined baking pan. Sprinkle half the sea salt flakes over the surface for an irresistible salty contrast. Pop this pan into the freezer for 2 to 3 hours until the peanut butter is firm enough to handle. This slab is what creates that luscious, gooey center everyone will adore!

Step 2: Get Your Pan Ready

When your peanut butter slab is chilling, grease a 20cm (8 inch) square pan lightly with butter and line it generously with baking paper, leaving some overhang to help you lift out the brownies later. This extra step makes cutting and serving so much easier and cleaner.

Step 3: Melt Butter and Chocolate

Place the butter and dark chocolate chips in a heatproof bowl and melt them together using short bursts in the microwave, stirring frequently until smooth and glossy. This silky mixture forms the luscious base of your brownies, so take your time to get it just right.

Step 4: Mix the Batter

Add the brown sugar to the warm melted chocolate and butter, mixing until combined. Then, whisk in the beaten eggs and vanilla extract until you have a smooth, molten batter. Finally, sift in the flour, cocoa powder, and cooking salt, stirring gently until just combined. Avoid overmixing to keep the brownies soft and tender.

Step 5: Assemble the Brownies

Pour half the brownie batter into the lined pan, spreading it evenly. Carefully lift the frozen peanut butter slab from the freezer and place it on top of this layer. Then, cover with the remaining batter, making sure the peanut butter slab is completely enclosed. Be gentle to keep the layers distinct and delicious.

Step 6: Create the Peanut Butter Swirls

Dollop the reserved 2 tablespoons of peanut butter randomly across the top of the batter. Using a butter knife or teaspoon, swirl the peanut butter through the batter with a flicking, twisting motion to create beautiful marbled patterns. This little extra step adds visual appeal and pockets of extra peanut butter in every bite.

Step 7: Bake to Perfection

Bake in a preheated oven at 180°C (350°F) for 32 minutes. The edges should be set and slightly firm, while the middle will jiggle gently – that’s exactly what you want because it will firm up nicely once cooled. Keep an eye on it, as oven temps can vary.

Step 8: Cool and Set

Allow the brownies to cool in the pan for one hour at room temperature. Then place them in the fridge for at least three hours or longer to let the peanut butter center set properly. This step is crucial for clean slicing and preventing the peanut butter from oozing out when you cut into them.

Step 9: Cut and Enjoy

Once chilled, lift the brownies out using the baking paper overhang. Cut into 16 generous squares and let them sit at room temperature for at least 15 minutes before serving. This resting time lets the brownies soften up slightly and makes for the perfect melt-in-your-mouth experience.

How to Serve Peanut Butter Stuffed Brownies Recipe

The image shows a square layered dessert in a pink baking pan lined with parchment paper, resting on a soft grey cloth over a white marbled surface. The dessert has two main layers swirled together on top: a dark brown chocolate layer and a light tan creamy layer, mixed in a marbled pattern that covers the whole top. The texture looks soft and slightly cracked in some areas, with tiny white flakes scattered lightly on the surface, giving it a bit of shine and contrast. photo taken with an iphone --ar 4:5 --v 7

Garnishes

These brownies are showstoppers on their own, but a few thoughtful garnishes make them even more special. A sprinkle of flaky sea salt on top just before serving enhances the chocolate-peanut butter combo, while a dusting of powdered sugar adds a delicate sweetness. If you’re feeling extra decadent, try drizzling melted chocolate or caramel sauce over the squares — the gooeyness is divine.

Side Dishes

Peanut Butter Stuffed Brownies Recipe pairs wonderfully with simple sides that complement its richness. A scoop of vanilla bean ice cream or a dollop of whipped cream cuts through the intensity and adds a refreshing chill. Fresh berries or sliced bananas add a lovely fruity contrast and bright color on the plate, balancing the deep flavors perfectly.

Creative Ways to Present

Presentation can take your brownies from everyday treat to party centerpiece. Serve them stacked on a beautiful platter with edible flowers for a rustic look. For a fun twist, turn them into brownie pops by inserting sticks after cutting, then dipping in chocolate and sprinkles. Wrapping individual brownies in parchment paper tied with twine also makes a charming gift for friends and family.

Make Ahead and Storage

Storing Leftovers

Once baked and fully set, store the Peanut Butter Stuffed Brownies in an airtight container at room temperature or in a cool, dry place for up to 3 days. This keeps them moist and fudgy without drying out. If your kitchen is warm, simply keep them covered in the fridge and bring back to room temperature before eating.

Freezing

These brownies freeze beautifully, making them perfect for prepping ahead. Wrap each cut square tightly in plastic wrap, then place in a freezer-safe container or bag. They can be frozen for up to 3 months. When you’re ready for a treat, thaw them overnight in the fridge or for a few hours at room temperature.

Reheating

If you like your brownies warm and gooey, gently reheat individual pieces in the microwave for about 15 seconds. This softens the peanut butter center and revives that freshly baked feel. Avoid overheating, as that can dry out the brownie or cause the peanut butter to melt too much.

FAQs

Can I use crunchy peanut butter instead of smooth?

Absolutely! Crunchy peanut butter will add a great texture contrast, but smooth peanut butter helps create a more even, creamy filling and swirls. It’s all about your preference—both work deliciously.

What if I don’t have dark chocolate chips?

You can substitute semi-sweet or milk chocolate chips, but dark chocolate offers a richer, more intense flavor that balances the sweetness and peanut butter perfectly. So, if possible, go for dark chocolate for the best outcome.

Is it necessary to freeze the peanut butter slab before baking?

Freezing the peanut butter slab helps it hold its shape and prevents it from melting into the brownie batter. This step is key to achieving those distinct layers and the stunning peanut butter center everyone loves.

Can I make these brownies gluten-free?

Yes! Simply swap out the plain flour for a gluten-free flour blend that is suitable for baking. Make sure the blend contains xanthan gum or another binder to keep the brownies tender and fudgy.

How do I avoid the peanut butter from oozing out when cutting?

The secret is patience. Cooling the brownies first at room temperature, then refrigerating them for several hours allows the peanut butter to set firmly. This keeps the layers intact for clean, beautiful slices.

Final Thoughts

This Peanut Butter Stuffed Brownies Recipe truly captures the joy of baking with its rich layers, silky textures, and heavenly flavors. Whether you’re making it for a family gathering, a party, or just an indulgent weekend treat, these brownies are guaranteed to delight everyone who tries them. So roll up your sleeves, bring out the peanut butter and chocolate, and get ready for some joyous baking that rewards you with every decadent bite.