Ingredients

• unsalted butter - ½ cup
• granulated sugar - 1 cup
• brown sugar - ½ cup
• large eggs - 2
• vanilla extract - 1 teaspoon
• all-purpose flour - ½ cup
• cocoa powder - ⅓ cup
• salt - ¼ teaspoon
• peanut butter - ½ cup

Instructions

1. 1.

   Preheat the oven to 350°F (175°C) and grease a 9x9 inch baking pan.

2. 2.

   In a medium saucepan, melt the butter over low heat. Remove from heat and stir in the granulated sugar and brown sugar until combined.

3. 3.

   Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

4. 4.

   In a separate bowl, whisk together the flour, cocoa powder, and salt.

5. 5.

   Gradually add the dry ingredients to the wet mixture, stirring until just combined.

6. 6.

   Pour the brownie batter into the prepared pan, spreading it evenly.

7. 7.

   In a small microwave-safe bowl, warm the peanut butter until softened, about 20 seconds.

8. 8.

   Dollop spoonfuls of peanut butter on top of the brownie batter and use a knife to swirl it through the batter.

9. 9.

   Bake for 20-25 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.

10. 10.

    Allow to cool completely in the pan before cutting into squares and serving.