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Ultra Fudgy Peanut Butter Swirl Brownies

A close-up of a fudgy peanut butter swirl brownies square showing the crackly top and creamy swirl.
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Make the best homemade brownie recipe featuring a rich, fudgy chocolate base marbled with creamy peanut butter. This decadent chocolate treat is perfect for satisfying your sweet tooth.

Ingredients

Scale
  • 1 cup (226g) unsalted butter, melted
  • 1 1/2 cups (300g) granulated sugar
  • 1 cup (200g) packed light brown sugar
  • 4 large eggs
  • 1 tablespoon vanilla extract
  • 1 cup (120g) all-purpose flour
  • 3/4 cup (75g) unsweetened cocoa powder
  • 1 teaspoon salt
  • 1/2 teaspoon baking powder
  • 1 cup (240g) semi-sweet chocolate chips
  • 1 cup (250g) creamy peanut butter
  • 1/4 cup (50g) granulated sugar (for swirl)
  • 1 large egg (for swirl)
  • 1/4 teaspoon salt (for swirl)

Instructions

  1. Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang for easy removal.
  2. In a large bowl, whisk together the melted butter and both sugars until combined.
  3. Add the 4 eggs and vanilla extract to the butter mixture. Whisk until smooth.
  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 just until combined. Do not overmix. Fold in the chocolate chips. This forms your fudgy brownie base.
  6. Prepare the peanut butter swirl mixture: In a medium bowl, combine the creamy peanut butter, 1/4 cup sugar, 1 egg, and 1/4 teaspoon salt. Mix until smooth and creamy.
  7. Spread two-thirds of the brownie batter evenly into the prepared pan.
  8. Dollop spoonfuls of the peanut butter mixture over the batter. Pour the remaining one-third of the brownie batter over the peanut butter layer.
  9. Use a knife or skewer to gently swirl the peanut butter mixture into the chocolate batter to create marbled brownies. Do not over-swirl, or the colors will blend completely.
  10. Bake for 30 to 35 minutes. The edges should look set, and a toothpick inserted near the center should come out with moist, fudgy crumbs attached, not wet batter.
  11. Let the brownies cool completely in the pan on a wire rack before lifting them out using the parchment overhang. Cut into squares and serve your gooey brownies.

Notes

  • For an extra rich flavor, use dark cocoa powder in the brownie base.
  • If you prefer a slightly firmer brownie, bake for an additional 3 to 5 minutes.
  • To achieve the best swirl that stays visible, ensure your peanut butter mixture is slightly thicker than your brownie batter.

Nutrition

Find it online: https://kitchenuser.net/peanut-butter-swirl-brownies/