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The Fudgiest Peanut Butter Swirl Brownies

A close-up of a fudgy peanut butter swirl brownies square showing rich chocolate texture and golden peanut butter swirls.
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Make rich, gooey, and moist peanut butter swirl brownies from scratch. This recipe delivers bakery-style results with a perfect chocolate and peanut butter marble.

Ingredients

Scale
  • 1/2 cup (115g) unsalted butter
  • 1 cup (200g) granulated sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 1/3 cup (40g) unsweetened cocoa powder
  • 1/2 cup (65g) all-purpose flour
  • 1/4 teaspoon salt
  • 1/4 teaspoon baking powder
  • 1/2 cup (120g) creamy peanut butter

Instructions

  1. Preheat your oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper, leaving an overhang for easy removal.
  2. In a medium saucepan, melt the butter over low heat. Remove from heat.
  3. Whisk the sugar into the melted butter until combined.
  4. Beat in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
  5. In a separate bowl, whisk together the cocoa powder, flour, salt, and baking powder.
  6. Gradually add the dry ingredients to the wet ingredients, mixing only until just combined. Do not overmix.
  7. Pour half of the brownie batter into the prepared pan and spread evenly.
  8. In a small bowl, briefly microwave the 1/2 cup of creamy peanut butter for about 15-20 seconds until it is slightly softened and easily spreadable.
  9. Drop spoonfuls of the softened peanut butter evenly over the batter in the pan.
  10. Pour the remaining brownie batter over the peanut butter layer.
  11. Use a knife or skewer to gently swirl the peanut butter into the chocolate batter to create a marbled effect. Do not over-swirl; aim for distinct ribbons.
  12. Bake for 25 to 30 minutes. A toothpick inserted near the center should come out with moist crumbs attached, not wet batter, for fudgy results.
  13. Let the brownies cool completely in the pan on a wire rack before lifting out and cutting into squares.

Notes

  • For the fudgiest brownies, avoid overbaking. The center should still look slightly underdone when you remove them from the oven.
  • If you prefer a thicker peanut butter layer, slightly warm the peanut butter before swirling to make it easier to spread.
  • You can use crunchy peanut butter for added texture if you prefer.

Nutrition

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