Flourless chocolate fudge cookies - GLUTEN FREE! Deep Dark Chocolate Cookies Adapted From Epicurious Nonstick vegetable oil spray 1 1/2 cups bittersweet chocolate chips (about 9 ounces), divided 3 large egg whites, room temperature 2 1/2 cups powdered sugar, divided (I used 2 cups) 1/2 cup unsweetened cocoa powder 1 tablespoon cornstarch 1/4 teaspoon salt