Ingredients

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

3. 3.

   Remove from heat, then stir in the granulated sugar, brown sugar, eggs, and vanilla until well combined.

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.

   Fold in the chocolate chips.

7. 7.

   Spread half of the brownie batter into the prepared baking pan.

8. 8.

   Spoon dollops of peanut butter over the batter, then swirl with a knife.

9. 9.

   Pour the remaining brownie batter on top and swirl again to combine slightly.

10. 10.

    Bake for 25-30 minutes, or until a toothpick comes out with a few moist crumbs.

11. 11.

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