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a stack of brownies on a plate.

Peanut Butter Swirl Brownies Recipe

Course: Bars, Dessert
Cuisine: American
Prep Time: 25 minutes
Cook Time: 25 minutes
Total Time: 50 minutes
Servings: 9 brownies
Calories: 356kcal
Author: Becky Hardin
These peanut butter brownies are moist and fudgy with a creamy, salty peanut butter swirl on top to take them to the next level!
Print Recipe

Equipment

  • Kitchen Scale (optional)
  • 9x9-inch Baking Pan
  • Hand Mixer or Stand Mixer

Ingredients

  • 4 ounces semisweet baking chocolate chopped*
  • ½ cup unsalted butter (1 stick)
  • ¾ cup granulated sugar
  • 2 large eggs room temperature
  • 1 teaspoon pure vanilla extract
  • ¼ teaspoon fine sea salt
  • 1 cup all-purpose flour
  • 3 tablespoons unsweetened cocoa powder **
  • cup creamy peanut butter ***

Instructions

  • Preheat oven to 350°F. Lightly butter a 9x9-inch metal baking pan and set aside.
    ingredients for a chocolate cake on a marble table.
  • In a small saucepan, melt the baking chocolate and butter over low heat until completely melted. Let cool slightly.
    4 ounces semisweet baking chocolate, ½ cup unsalted butter
    ingredients for chocolate brownies on a marble table.
  • Pour the melted chocolate into a mixing bowl and use a hand mixer to mix in the granulated sugar, eggs, vanilla extract, and sea salt.
    ¾ cup granulated sugar, 2 large eggs, 1 teaspoon pure vanilla extract, ¼ teaspoon fine sea salt
    ingredients for a chocolate cake on a marble table.
  • Stir in the flour and cocoa powder.
    1 cup all-purpose flour, 3 tablespoons unsweetened cocoa powder
    a bowl of brown and white flour and a spoon.
  • Spread the brownie batter into the prepared pan.
    a square black pan with a brown substance in it next to a bowl of peanut butter and a knife.
  • Place the peanut butter in a microwave-safe bowl and microwave for 30-60 seconds, or until it becomes runny.
    ⅓ cup creamy peanut butter
  • Drizzle the peanut butter over the brownie batter and use a skewer or butter knife to swirl the peanut butter and brownie batter.
    a baking pan filled with chocolate and peanut butter.
  • Bake for 25-28 minutes, or until the middle is no longer jiggly. Allow to cool completely in the pan before cutting into squares and removing.
    a group of square brownies on a table next to a glass of milk.

Notes

*Be sure to use high-quality baking chocolate for the best melt and texture. Dark, milk, or semisweet will all work well.
**You can use any unsweetened cocoa powder here. Natural cocoa powder will have a slight acidity, while Dutch-process will have a smoother taste.
***I used Jif No Added Sugar, but any creamy peanut butter or other nut butter (almond, cashew, tahini, or sunflower seed) should work fine. 
Tips:
  • I recommend using a metal baking pan. If using glass or ceramic, lower the oven temperature by 25°F.
  • You can use a double-boiler or microwave-safe bowl to melt your chocolate if you prefer. Just be sure to melt low and slow to avoid scorching the chocolate.
  • Measure the flour using the spoon-and-level method to avoid dense, dry brownies.
  • Prefer your brownies more cake-like? Add an extra egg or reduce the butter by a tablespoon or two for a lighter crumb. Just keep in mind: the texture will shift, and the swirl might not hold quite as beautifully.
  • Always bake brownies on the middle rack of the oven to avoid burning the tops or bottoms.
Make-Ahead:  You can chill the brownie batter in the refrigerator for up to 2 days for a richer and chewier brownie.
Storage: Store peanut butter brownies in an airtight container at room temperature for up to 4 days, in the refrigerator for up to 1 week, or in the freezer for up to 3 months.

Nutrition

Serving: 1brownie | Calories: 356kcal | Carbohydrates: 37g | Protein: 6g | Fat: 21g | Saturated Fat: 11g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 7g | Trans Fat: 0.4g | Cholesterol: 69mg | Sodium: 125mg | Potassium: 185mg | Fiber: 2g | Sugar: 22g | Vitamin A: 381IU | Calcium: 26mg | Iron: 2mg