Preheat your oven to 350°F (175°C) and prepare a baking pan.

Melt the unsalted butter and let it cool slightly.

In a large bowl, whisk the melted butter with granulated sugar and brown sugar until well combined.

Add the eggs, one at a time, and mix well after each addition.

Stir in the vanilla extract for flavor.

In a separate bowl, whisk together the flour, cocoa powder, and salt.

Gradually fold the dry ingredients into the wet mixture until just combined.

If using, fold in the chocolate chips.

Pour the brownie batter into the prepared pan and spread it evenly.

Bake for 25-30 minutes, until a toothpick inserted in the center comes out with a few moist crumbs.

Allow the brownies to cool in the pan before slicing.