Fit piecrust into a 9-inch pie plate according to package directions; fold edges under, and crimp.
Stir together sugar and next 4 ingredients until well blended; stir in walnuts and chocolate. Pour filling into piecrust.
Bake at 350° on lowest oven rack for 30 minutes or until pie is set; cool on wire rack.
Recipe from My Old Kentucky Homes Cookbook as contributed to Best of the Best From Kentucky Cookbook (Quail Ridge Press, $16.95)