You cook chocolate brownies by mixing melted butter and sugar, then whisking in eggs and vanilla extract until the batter is smooth and creamy. Fold in cocoa powder, all purpose flour, salt, and chocolate chips just until combined without overmixing. Spread the rich batter evenly into a greased baking pan and bake in the oven at three hundred and fifty degrees for about twenty five minutes. Allow the baked brownies to cool completely before cutting them into delicious squares.