Sift together flour, sugar, soda and salt. Cut in shortening and peanut butter until mixture resembles meal. Blend in corn syrup and milk. Shape into 2-inch high roll. Chill. Slice 1/8 to 1/4 inch thick. Place half the slices on ungreased cookie sheet, spread each with 1/2 teaspoon peanut butter. Cover with remaining slices, seal edges with fork. Bake at 350° for 12 minutes. Let cool on sheet. Makes 2 dozen.