Chocolate Peanut Butter Brownies for 16

Instructions:

1. Preheat the oven to 350°F (175°C) and line an 8x8 inch baking pan with parchment paper, leaving an overhang on two sides.
2. Whisk the melted butter and granulated sugar together until combined, then beat in the eggs and vanilla extract until glossy.
3. Sift in the cocoa powder, flour, and salt, folding gently with a spatula until just combined. Fold in the semi-sweet chocolate chips.
4. Pour the chocolate batter into the prepared pan and smooth the surface.
5. In a small bowl, stir together the peanut butter, powdered sugar, and melted butter until smooth.
6. Drop dollops of the peanut butter mixture onto the raw brownie batter and use a toothpick or knife to swirl in a figure-eight motion.
7. Bake for 22–25 minutes until the edges are set and the center has a slight jiggle.
8. Remove from the oven and let the brownies cool completely in the pan for at least 30 minutes to allow the structure to set.