Peanut Butter Swirl Brownie Recipe

Fudgy, gooey, and swirled with peanut buttery goodness — makes 12!

If chocolate and peanut butter had a love child, it would be these brownies. Rich, chewy, and ridiculously easy to make, these peanut butter swirl brownies are your next go-to bake when that sweet tooth comes knocking. No fancy ingredients, no complicated steps — just pure brownie bliss with a swirl of peanut butter magic.

Easy Peanut Butter Swirl Brownies

Makes 12

What You’ll Need:

(a.k.a. your brownie dream team)

• 1/2 cup (115g) unsalted butter, melted

• 1 cup (200g) granulated sugar

• 2 large eggs

• 1 tsp vanilla extract

• 1/3 cup (40g) cocoa powder

• 1/2 cup (65g) all-purpose flour

• 1/4 tsp salt

• 1/4 tsp baking powder

• 1/2 cup peanut butter (the smoother, the swirlier — but chunky works too!)

How to Make Peanut Butter swirl Brownies:

Preheat and prepare: Set your oven to 350°F (175°C). Line a 9x9-inch baking pan with parchment paper or lightly grease it.

Mix the batter: In a large bowl, whisk together the melted butter and sugar until smooth. Add the eggs one at a time, mixing well after each, then stir in the vanilla. Sift in the cocoa powder, flour, salt, and baking powder. Stir just until everything is combined.

Prepare the peanut butter swirl: Warm the peanut butter in the microwave for 20–30 seconds so it’s easier to swirl. If it feels too thick, add a splash of milk to loosen it up.

Assemble: Pour the brownie batter into the pan and spread it evenly. Drop spoonfuls of peanut butter over the top, then gently swirl it through the batter with a knife or skewer.

Bake: Place in the oven and bake for 20–25 minutes. You’re aiming for set edges and a slightly gooey center. A toothpick should come out with a few moist crumbs.

Cool and cut: Let the brownies cool in the pan before slicing into 12 squares. Store any extras in an airtight container (if there are any left!).

Why You’ll Fall in Love with These Brownies

They’re easy. They’re rich. They’re swirly and a little bit messy — in the best possible way. Whether you’re baking for a party, a date night, or just yourself, these peanut butter brownies are your new BFF.

Frequently Asked Brownie Questions

Can I use almond butter instead of peanut butter?

Sure can! Just make sure it’s the smooth kind for best swirlage.

How do I store them?

Airtight container, room temp, 3–4 days — if they last that long. They also freeze like a dream!

Craving more chocolatey goodness?

Check out my NYC Chocolate Chunk Cookies or Rolo Brownie Bites for more sweet tooth adventures!

Enjoy :)