Combine sugar, flour, baking powder, butter and margarine. Work together with pastry fork. Mix well; add eggs. Mix with hands until dough forms. Divide dough in half, put one half in fridge to chill. Fit remaining dough over large cookie sheet. Spread fruit filling on top of dough. Using a grater, grate chilled dough over top of fruit. Bake at 400 degrees for 15 minutes, lower to 325 degrees for 35-45 minutes. Cool. Sprinkle with powdered sugar. Cut into squares.