In a bowl stir together the brown sugar, 1/2 stick of the butter, the graham cracker crumbs, and the peanut butter until the mixture is smooth and chill the mixture, covered, for 1 hour, or until it is firm enough to form into balls. Form teaspoonfuls of the mixture into balls and transfer the balls as they are formed to a baking sheet lined with wax paper. In a metal bowl set over a pan of barely simmering water melt the chocolate chips with the remaining 3/4 stick butter, stirring until the mixture is smooth, and let the chocolate mixture cool. Dip the balls into the chocolate mixture with a fork, coating them well and letting the excess drip off, transfer them as they are coated to the baking sheet, and chill them, covered loosely, for at least 1 hour or overnight. (The balls may be double-dipped if desired.) Makes abut 40 chocolate peanut butter balls. Gourmet September 1991