01 -
Preheat the oven to 350°F. Line a 9x9 inch baking pan with parchment paper, leaving overhang for easy removal. Lightly coat parchment with nonstick cooking spray.
02 -
In a small bowl, whisk together the flour, cocoa powder, baking powder, kosher salt, and chocolate chips until evenly combined.
03 -
In a medium bowl, add melted and cooled butter. Incorporate granulated sugar, brown sugar, eggs, and vanilla extract; stir just until combined.
04 -
Gently fold the dry ingredient mixture into the wet ingredients until just combined, avoiding overmixing to prevent tough brownies.
05 -
Spread half of the batter evenly into the prepared pan. Dollop 2/3 cup of creamy peanut butter over the batter in teaspoons.
06 -
Spread the remaining batter evenly over the peanut butter dollops, covering them completely.
07 -
Warm the remaining 1/3 cup creamy peanut butter in the microwave for 10 seconds and stir until smooth. Drizzle over the top batter layer and swirl with a knife to create a marbled effect.
08 -
Bake for approximately 30 minutes, until a toothpick inserted into the center comes out with a few moist crumbs.
09 -
Allow brownies to cool completely at room temperature for 2 hours. Cut into 4x4 slices and serve.