Jam Thumbprints

Directions

1. 1
   Cream together butter and sugar until fluffy.
2. 2
   Add egg yolks, vanilla and salt; beat well.
3. 3
   Gradually add flour, mixing well. Shape into 3/4-inch balls; dip in 2 slightly beaten egg whites, then roll in finely chopped walnuts lightly covering ball.
4. 4
   Place 1 inch apart on greased cookie sheet.
5. 5
   Press down center of each ball with thumb.
6. 6
   Bake at 350° for 15 to 17 minutes.
7. 7
   Let cool, then add cherry or strawberry preserves in center.