These jumbo-sized treats are a brownie lover’s dream with bittersweet chocolate and milk- and white-chocolate chips. Plus they're convenient; ready to serve, no portioning required—easily portable too. This recipe appears in our cookbook "Martha Stewart's Cookie Perfection" (Clarkson Potter).
For a nutty version, stir 1/2 cup chopped walnuts or pecans into the batter with the chocolate chips. To make squares instead of cups, bake the batter in an eight-inch square pan, lined with buttered parchment, for 35 to 40 minutes, and then cut into 2 1/2-inch squares.