01 -
Preheat the oven to 350°F (175°C). Grease an 8×8-inch baking pan or line it with parchment paper.
02 -
In a mixing bowl, whisk together the melted butter and granulated sugar until combined.
03 -
Mix in the eggs and vanilla extract until smooth.
04 -
Sift in the cocoa powder, all-purpose flour, and salt. Stir until just combined, being careful not to overmix.
05 -
Fold in the chopped Oreo cookies and chocolate chips, if using.
06 -
Pour the batter into the prepared pan and spread evenly. Press a few extra Oreo pieces on top for decoration.
07 -
Bake for 25–30 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.
08 -
Allow the brownies to cool completely before slicing into squares.