Preheat your oven to 350°F (175°C) and line an 8x8" baking pan with parchment paper.

Melt one stick of butter in a medium saucepan over low heat or in the microwave until fully melted.

In a large bowl, combine melted butter and sugar, stirring until smooth. Add in the eggs one at a time, mixing well after each.

Gently fold in cocoa powder, flour, and chocolate chips until just combined to form a thick batter.

Pour the batter into the prepared pan and bake for 28 minutes, checking that the center is still slightly gooey.

Let the brownies cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.