9min · 24 servings 2 cups (250 g), plus 1 tablespoon all-purpose flour, spooned and leveled (divided) 3/4 cup (95 g) bread flour, spooned and leveled 1 teaspoon baking soda 1 teaspoon cornstarch 3/4 teaspoon salt 1 cup (226 g) unsalted butter, cold and cubed 3/4 cup (150 g) C&H® light brown sugar 1/2 cup (100 g) C&H® granulated sugar 1 large egg, plus one egg yolk, room temperature 2 teaspoons vanilla 1 tablespoon Dutch process cocoa powder, sifted 4 ounces semi-sweet or bittersweet chocolate chips (or chopped chocolate bar), melted 1/2 cup semi-sweet chocolate chips, optional