Blend shortening, sugar, egg and flavoring. Combine flour, salt, and baking powder. Add to shortening mixture and blend well. Spread half of dough in 8 x 8 inch greased pan. Spread preserves. Spread remaining dough onto waxed paper and cut to fit pan. Place upside down over preserves and peel off waxed paper. Bake for 20 to 25 minutes at 400 degrees. Cool and cut into squares.