Blend well together the peanut butter and shortening; beat in the brown sugar and Maple Syrup. Add egg and beat well. Sift flour with baking soda, baking powder, and salt. Add to first mixture, beating thoroughly. Turn out on floured board and divide in half. Shape each half into a roll about 2 inches in diameter. Wrap well in waxed paper and chill overnight. Cut in slices about ¼ inch thick and place on an ungreased baking sheet. Bake in 350 degree oven for about 12 min., or until light golden brown. Makes about 4 dozen.