Peanut Butter Brownies in 30 Minutes: Dense and Fudgy

Instructions:

1. Preheat your oven to 350°F (175°C). Line an 8x8-inch square baking pan with parchment paper, leaving an overhang on two sides for easy removal.
2. In a large microwave-safe glass bowl, melt 1/2 cup of butter. While hot, whisk in the granulated sugar and light brown sugar until the mixture resembles wet sand.
3. Add the eggs and vanilla extract to the sugar mixture. Whisk vigorously for 2 minutes until the batter lightens in color and becomes glossy to ensure a crackly top.
4. Sift in the cocoa powder, flour, and salt. Use a silicone spatula to fold the dry ingredients into the wet mixture until just combined, then fold in the chocolate chips.
5. In a separate small bowl, whisk together the creamy peanut butter, powdered sugar, and 1 tablespoon of melted butter until smooth.
6. Pour the chocolate brownie batter into the prepared pan. Dollop the peanut butter mixture over the top and use a toothpick or butter knife to marble the two together.
7. Bake for 30 minutes or until a toothpick inserted comes out with a few moist crumbs. Let the brownies rest in the pan for 15 minutes before slicing into 16 squares.