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 sifted flour, mixing well.
4. 4
   Shape in 3/4-inch balls; dip in beaten egg whites and roll in walnuts.
5. 5
   Place 1-inch apart on greased cookie sheet.
6. 6
   Press down center of each with thumb.
7. 7
   Bake at 350° for 15 to 17 minutes.
8. 8
   Cool slightly; remove from pan and cool on rack.
9. 9
   Just before serving, use 1/3 cup cherry or strawberry preserves to fill centers of cookies.
10. 10
    Makes 3 dozen.