Buckeye Brownies Ingredients For the Brownies: ⅓ cup Dutch-processed cocoa 1½ teaspoons instant espresso (optional) ½ cup plus 2 Tablespoons boiling water 2 ounces unsweetened chocolate, finely chopped 4 tablespoons (2 ounces) unsalted butter, melted ½ cup plus 2 Tablespoons vegetable oil 2 eggs 2 egg yolks 2 teaspoons vanilla extract 2½ cups granulated