Preheat the oven to 350°F (175°C).

Grease a 9x13 inch baking pan with butter or line it with parchment paper.

In a large bowl, melt the butter and mix in the granulated sugar.

Add the eggs, one at a time, followed by the vanilla extract.

Sift together the flour, cocoa powder, baking powder, and salt in a separate bowl.

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

Gently stir in the chocolate chips until evenly distributed.

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

Bake for 25-30 minutes or until a toothpick inserted into the center comes out with moist crumbs.

Let the brownies cool in the pan for at least 20 minutes before slicing.