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4.34 from 3 votes

Peanut Butter Chocolate Swirl Brownies

Extra-fudgey, chocolatey, nutty, and SO delicious. These Peanut Butter Chocolate Swirl Brownies are truly the perfect treat!
Prep Time20 mins
Cook Time1 hr 10 mins
Total Time1 hr 30 mins
Course: Desserts
Cuisine: American
Servings: 16
Calories: 424kcal
Author: Traci


  • 1 cup creamy peanut butter
  • 7 Tablespoons salted butter, softened
  • 10 ounces semi-sweet chocolate
  • 7 Tablespoons salted butter
  • 5 large eggs
  • 1 ½ cups sugar
  • 1 Tablespoon vanilla
  • 1 ½ cups flour


  • Heat oven to 275 degrees.
  • Spray a 9-inch square pan with baking spray. Set aside.
  • In a medium bowl, combine 7 Tablespoons of the butter with the peanut butter.
  • Microwave in 30 second intervals, stirring after each, until melted and creamy. Set aside.
  • Place chocolate and remaining butter in a medium bowl and microwave in 30 second intervals, stirring after each, until melted .
  • Stir until smooth and combined completely. Set aside.
  • In the bowl of a stand mixer, combine eggs, sugar, and vanilla.
  • Beat at high speed for 10 minutes.
  • Reduce speed to low and stir in flour.
  • Pour half of batter into the peanut butter mixture and half into the chocolate mixture.
  • Stir each until thoroughly combined.
  • Spread half of peanut butter mixture in bottom of prepared pan.
  • Top with all of chocolate mixture.
  • Spoon remaining peanut butter mixture in randomly spaced dollops on top of chocolate mixture.
  • Use a knife (or something similar) to swirl the peanut butter with the chocolate.
  • Bake until puffy and cooked through, about 1 hour and 10 minutes.


  • You can use crunchy peanut butter instead of creamy for an extra added crunch in the brownies!
  • You can use milk chocolate instead of semi-sweet.
Expert Tips:
  • The flaked salt on top is totally optional, but definitely delicious!
  • Don't push the knife all the way down when swirling the chocolate and the peanut butter. Just about halfway through.
  • You may need to cover the brownies while baking to keep from over browning.


Serving: 1 | Calories: 424kcal | Carbohydrates: 40g | Protein: 8g | Fat: 26g | Saturated Fat: 12g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 9g | Trans Fat: 1g | Cholesterol: 79mg | Sodium: 184mg | Potassium: 241mg | Fiber: 3g | Sugar: 27g | Vitamin A: 393IU | Calcium: 31mg | Iron: 2mg