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Ultra Fudgy Peanut Butter Swirl Brownies: Mastering the Perfect Gooey Swirl

A close-up of a gooey peanut butter swirl brownies square served on a white plate.
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You will make rich, fudgy chocolate brownies with a creamy peanut butter swirl. This recipe delivers decadent, bakery-style results that are easy to achieve at home.

Ingredients

Scale
  • 1 cup (226g) unsalted butter, melted
  • 2 cups (400g) granulated sugar
  • 4 large eggs
  • 1 tablespoon vanilla extract
  • 1 cup (120g) all-purpose flour
  • 3/4 cup (75g) unsweetened cocoa powder
  • 1/2 teaspoon salt
  • 1/4 teaspoon baking powder
  • 1 cup (240g) semi-sweet chocolate chips
  • 1 cup (250g) creamy peanut butter (do not use natural style)
  • 1/4 cup (50g) powdered sugar
  • 1 large egg (for the swirl)

Instructions

  1. Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.
  2. In a large bowl, whisk together the melted butter and granulated sugar until combined. This step helps create that fudgy texture.
  3. Whisk in the 4 large eggs one at a time until fully incorporated. Stir in the vanilla extract.
  4. In a separate bowl, whisk together the flour, cocoa powder, salt, and baking powder.
  5. Gradually add the dry ingredients to the wet ingredients, mixing only until just combined. Do not overmix. Fold in the chocolate chips.
  6. Pour about two-thirds of the brownie batter into the prepared pan and spread evenly.
  7. Prepare the peanut butter swirl mixture: In a medium bowl, combine the creamy peanut butter, powdered sugar, and the remaining 1 egg. Mix until smooth and creamy.
  8. Drop spoonfuls of the peanut butter mixture over the brownie batter in the pan.
  9. Pour the remaining one-third of the chocolate batter over the peanut butter dollops.
  10. Use a knife or a skewer to gently swirl the peanut butter and chocolate layers together. Do not over-swirl; you want distinct ribbons of color.
  11. Bake for 30 to 35 minutes. The edges should look set, and a toothpick inserted near the center should come out with moist crumbs attached, not wet batter. This ensures a gooey center.
  12. Let the brownies cool completely in the pan on a wire rack before lifting them out using the parchment overhang and cutting them into squares.

Notes

  • For the fudgiest results, use good quality cocoa powder and avoid using natural style peanut butter, as the oil separation can affect the swirl texture.
  • Cooling completely before cutting is key to getting clean slices of your marbled treats.
  • If you want a thicker brownie, use an 8×8 inch pan instead, but increase the baking time by about 10-15 minutes.

Nutrition

Find it online: https://flavorzine.com/peanut-butter-swirl-brownies/