Start by preheating your oven to 350°F (175°C). Grease or line an 8×8-inch baking pan with parchment paper for easy removal.
In a large mixing bowl, whisk together the melted butter and granulated sugar until smooth. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
In a separate bowl, sift together the cocoa powder, flour, salt, and baking powder. Gradually fold the dry ingredients into the wet mixture, mixing until just combined. Be careful not to overmix.
For extra chocolatey goodness, fold in the chocolate chips.
Pour the batter into your prepared baking pan and spread it evenly. Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Let the brownies cool completely in the pan before slicing into squares. Serve as is, or top with a scoop of vanilla ice cream for an extra treat.