Ingredients
Method
Preparation
- Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan or line it with parchment paper.
 - In a large mixing bowl, whisk together the granulated sugar, brown sugar, and melted butter until smooth.
 - Beat in the eggs, one at a time, and mix in the vanilla extract until combined.
 - In another bowl, sift together the flour, cocoa powder, and salt. Gradually fold the dry mixture into the wet ingredients until just combined.
 - Pour the brownie batter into the prepared pan and spread evenly.
 - In a separate bowl, mix together the peanut butter and melted chocolate chips until well-blended and creamy. Drop spoonfuls of this mixture over the brownie batter.
 - Using a knife or toothpick, swirl the peanut butter mixture into the brownie batter to create a marbled effect.
 - Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out mostly clean.
 - Allow to cool in the pan before cutting into squares.
 
Notes
Serve with vanilla ice cream or whipped cream. Store brownies in an airtight container at room temperature for up to three days, or refrigerate for up to a week. Reheat in the microwave for a few seconds for fresh warmth.
