HEAT oven to 350°F. CREAM together shortening, sugar and almond extract in large bowl until well combined. Add egg; beat until light and fluffy. Add ground almonds, flour and salt; mix on medium speed of mixer until well blended. ROLL dough into 1-inch balls; place on ungreased baking sheets. Indent each ball with thumb. BAKE 20 to 25 minutes. Fill each indent with scant 1/2 teaspoon preserves. Return to oven; bake an additional 5 minutes. Let stand 5 minutes, then remove to rack to cool completely. Sprinkle with powdered sugar when cooled, if desired.