Peanut Butter Brownies – Fudgy, Easy & Irresistible

If you love the combination of rich chocolate and creamy peanut butter, these peanut butter brownies are about to become your new obsession. Fudgy, dense, and loaded with peanut butter flavor in every single bite — this is the brownie recipe you’ve been waiting for.

Whether you’re baking for a party, a bake sale, or just a cozy night in, this easy peanut butter brownie recipe comes together in under 40 minutes with simple pantry ingredients. No fancy equipment needed!

Why You’ll Love This Peanut Butter Brownie Recipe

• Ultra fudgy texture — dense, moist, and chewy in all the right ways
• Rich peanut butter flavor — swirled throughout every bite
• Easy one-bowl recipe — minimal cleanup, maximum reward
• Ready in 40 minutes — perfect for last-minute cravings
• Crowd-pleaser — kids and adults absolutely love them

Ingredients You’ll Need

Here’s what goes into these irresistible peanut butter brownies:

• 1/2 cup (115g) unsalted butter
• 1 cup (200g) granulated sugar
• 2 large eggs
• 1 tsp vanilla extract
• 1/3 cup (40g) unsweetened cocoa powder
• 1/2 cup (65g) all-purpose flour
• 1/4 tsp salt
• 1/4 tsp baking powder
• 1/2 cup (130g) creamy peanut butter
• 1/4 cup (45g) chocolate chips (optional but recommended!)

How to Make Peanut Butter Brownies (Step by Step)

Step 1: Preheat and Prep

Preheat your oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper, leaving some overhang on the sides for easy lifting.

Step 2: Melt the Butter

In a medium saucepan over low heat (or in a microwave-safe bowl), melt the butter. Remove from heat and let cool slightly.

Step 3: Mix the Brownie Batter

Whisk the sugar into the melted butter until combined. Add the eggs one at a time, whisking well after each addition. Stir in the vanilla extract. Fold in the cocoa powder, flour, salt, and baking powder until just combined — do not overmix.

Step 4: Add the Peanut Butter Swirl

Pour the brownie batter into the prepared pan. Drop spoonfuls of peanut butter evenly over the top. Use a knife or skewer to swirl the peanut butter into the batter, creating a beautiful marbled effect. Sprinkle chocolate chips on top if using.

Step 5: Bake

Bake for 25–30 minutes, until the edges are set and a toothpick inserted in the center comes out with a few moist crumbs (not wet batter). Do not overbake — the brownies will firm up as they cool!

Step 6: Cool and Slice

Let the brownies cool in the pan for at least 20 minutes before lifting out and slicing into squares. For the cleanest cuts, use a sharp knife wiped clean between each slice.

Tips for the Best Peanut Butter Brownies

• Use creamy peanut butter — natural peanut butter can be oily and affect the texture. Stick to classic creamy like Jif or Skippy.
• Don’t overmix the batter — overmixing develops gluten and makes brownies cakey instead of fudgy.
• Room temperature eggs — they incorporate more evenly into the batter.
• Check early — every oven is different. Start checking at 23 minutes.
• Chill before slicing — for extra clean squares, refrigerate for 30 minutes after cooling.

Variations to Try

• Peanut butter cup brownies — press mini Reese’s cups into the batter before baking
• Gluten-free version — substitute with a 1:1 gluten-free flour blend
• Extra fudgy — reduce flour by 2 tablespoons
• Nutella swirl — swap half the peanut butter for Nutella
• Salted caramel drizzle — drizzle on top after baking for a gourmet touch

How to Store Peanut Butter Brownies

Room temperature: Store in an airtight container for up to 4 days.

Refrigerator: Keep for up to 1 week. Let them come to room temperature before serving or microwave for 10 seconds.

Freezer: Wrap individual brownies in plastic wrap and freeze for up to 3 months. Thaw at room temperature overnight.

Frequently Asked Questions

Can I use natural peanut butter?

You can, but the results may be slightly oilier or drier depending on the brand. For best results, stick to conventional creamy peanut butter like Jif, Skippy, or Peter Pan.

Why are my peanut butter brownies cakey instead of fudgy?

Cakey brownies usually mean too much flour or too many eggs. Make sure to measure flour correctly (spoon into measuring cup, level off) and don’t overmix the batter.

Can I double the recipe?

Absolutely! Double all ingredients and bake in a 9×13 inch pan. Add 5–10 extra minutes of baking time and check with a toothpick.

Are peanut butter brownies gluten-free?

This recipe is not gluten-free as written, but you can easily make it gluten-free by substituting the all-purpose flour with a 1:1 gluten-free baking flour blend.

What goes well with peanut butter brownies?

They are amazing served warm with a scoop of vanilla ice cream, a drizzle of chocolate sauce, or a glass of cold milk. You can also crumble them over ice cream for an indulgent brownie sundae!