Stuffed Peanut Butter Brownies

Stuffed Peanut Butter Brownies are the ultimate indulgence for chocolate and peanut butter lovers alike. The first time I made these, it was for a weekend movie night—and they were such a hit that now they’re requested for every occasion from birthdays to bake sales. With layers of rich, fudgy brownie and creamy peanut butter, these bars are as satisfying as they are decadent.

What makes these brownies so irresistible is the gooey peanut butter center and the pretty swirl on top. They’re bold, beautiful, and full of that classic flavor combo we all adore.

Why You’ll Love This Recipe

• Ultra-Rich and Fudgy: Deep cocoa flavor with a dense, chewy texture.
• Peanut Butter Center: A creamy middle layer that makes every bite extra special.
• Crowd-Pleaser: Perfect for gatherings, potlucks, or just treating yourself.
• Easy to Make: Simple ingredients, no fancy equipment required.
• Beautiful Swirl Top: Makes them look bakery-worthy.
• Customizable: Add chocolate chips, chopped peanuts, or sea salt for extra flair.

Ingredients You’ll Need

• 1 1/4 cups all-purpose flour
• 1 cup unsweetened cocoa powder (Hershey’s Dark preferred)
• 1 teaspoon kosher salt
• 1 cup (2 sticks) salted butter, melted and hot
• 1/4 cup canola oil
• 1 1/2 cups granulated sugar
• 1 cup packed brown sugar (light or dark)
• 4 large eggs
• 1 tablespoon pure vanilla extract
• 2 1/2 cups creamy peanut butter

Substitutions and Tips:

• Use dark chocolate chips or chunks in the batter for extra gooeyness.
• Substitute almond butter or sunflower seed butter for a twist.
• Add a sprinkle of flaky sea salt on top before baking for contrast.

Step-by-Step Instructions

Step 1: Preheat and Prep

Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving overhang for easy removal.

Step 2: Mix Dry Ingredients

In a large bowl, whisk together flour, cocoa powder, and salt. Set aside.

Step 3: Combine Wet Ingredients

In another large bowl, whisk together the melted butter, canola oil, granulated sugar, and brown sugar until well blended and glossy.

Add eggs one at a time, whisking well after each addition. Stir in vanilla extract.

Step 4: Combine Wet and Dry

Gradually stir the dry ingredients into the wet ingredients just until combined. Do not overmix.

Step 5: Layer the Brownies

Pour half of the brownie batter into the prepared pan and spread evenly.

Drop spoonfuls of 1 1/4 cups peanut butter over the batter, then gently spread into a layer.

Top with the remaining brownie batter, smoothing the surface.

Step 6: Swirl the Top

Warm the remaining 1 1/4 cups peanut butter in the microwave for about 15–20 seconds until pourable.

Drizzle over the top in a zigzag pattern. Use a knife to create swirls.

Step 7: Bake

Bake for 35–40 minutes, or until a toothpick inserted into the center comes out with moist crumbs (not wet batter).

Step 8: Cool and Slice

Let brownies cool completely in the pan before lifting out and slicing into 16 bars.

Tip: Chill before cutting for cleaner slices and a firmer texture. Use a warm knife for smooth edges.

Serving and Storage Tips

Serve these brownies slightly chilled or at room temperature. Store in an airtight container at room temperature for up to 3 days, or in the fridge for up to 5 days. Freeze for up to 2 months, wrapped tightly.

Reheat in the microwave for a warm, gooey treat.

Helpful Notes

• Use Quality Cocoa: Dark cocoa gives a deeper, more complex flavor.
• Hot Butter Matters: It helps dissolve the sugar for a shiny, crackly top.
• Room Temp Eggs: Help batter mix smoothly and evenly.
• Don’t Overbake: The brownies will continue to set as they cool.

Frequently Asked Questions

1. Can I use natural peanut butter?
   Yes, but make sure it’s well-stirred and not too oily for best results.
2. How do I keep the peanut butter layer smooth?
   Warm it slightly before spreading to make it easier to layer.
3. Can I halve the recipe?
   Absolutely—use an 8×8-inch pan and reduce bake time slightly.
4. Why are my brownies dry?
   Likely from overbaking. Start checking at 35 minutes.
5. Do I need to chill them before cutting?
   It’s optional but highly recommended for neat slices.
6. Can I use chunky peanut butter?
   Yes, for added texture. Just note that it may be harder to swirl.

Final Thoughts

Stuffed Peanut Butter Brownies are pure comfort food, combining rich chocolate with creamy peanut butter in every bite. Whether you’re baking for a party, a holiday, or just because, these brownies bring the wow factor and satisfy every sweet tooth.

Have you baked these before? What fun variations have you tried—Nutella, caramel, or maybe cookie dough? I’d love to hear your twist!