Preheat oven to 350°. Beat butter and sugar with an electric mixer until light and fluffy. Beat in egg and almond extract. Add flour, baking powder and salt; beat until blended. Spread in an ungreased 9" x 9" pan; smooth the surface. Spread jam on surface. Sprinkle almonds over jam. Bake 20 minutes or just until edges are golden. Cool, then cut into 1 ½-inch squares.