Preheat your oven to 350°F (175°C) and line an 8×8-inch baking pan with parchment paper.

Melt the butter in a medium saucepan over low heat. Stir in granulated and brown sugars until smooth.

Remove from heat, cool slightly, and whisk in eggs one at a time followed by vanilla extract.

In a separate bowl, combine flour, cocoa powder, and a pinch of salt. Gradually fold into the wet mixture until just combined.

Gently fold in chocolate chips. Pour the batter into the prepared pan and spread evenly.

Bake for 25-30 minutes until a toothpick comes out with moist crumbs. Cool before slicing.