FOR THE DARK CHOCOLATE BROWNIES: – 6 ounces (1 cup) bittersweet chocolate (+/- 70% cacao) – 1/2 cup unsalted butter – 1/2 cup granulated sugar – 1/2 cup packed light brown sugar – 2 large egg – 2 teaspoons vanilla extract – 1 cup all-purpose flour – 1/2 teaspoon salt FOR THE MILK CHOCOLATE BROWNIES: – 6 ounces (1 cup) milk chocolate – 1/2 cup unsalted butter – 1/2 cup granulated sugar – 1/4 cup firmly packed light brown sugar – 2 large egg – 2 teaspoons vanilla extract – 1 cup all-purpose flour – 1 tablespoon unsweetened cocoa powder – 1/2 teaspoon salt