Cream together sugar, and peanut butter. Add biscuit mix, egg and milk. Mix well. Spoon into greased and floured 8-inch square pan. Drop jam by teaspoonfuls on top of batter. Cut through batter with knife to marble jam through the cake. Bake at 375 F degree oven 30 minutes. Cut into nine squares. Serve warm or cold. Reprinted with permission from _Just Cakes_ From the C and H Sugar Kitchen Electronic format by Karen Mintzias