Jam Thumbprints

Directions

1. 1
   Stir together flour and salt.
2. 2
   Beat butter for 30 seconds; add sugar and beat until fluffy.
3. 3
   Add egg yolks and vanilla; beat well.
4. 4
   Add dry ingredients to beaten mixture, beating until well combined.
5. 5
   Cover and chill 1 hour.
6. 6
   Shape into 1-inch balls; roll in egg whites and then roll in finely chopped walnuts.
7. 7
   Place 1 inch apart on an ungreased cookie sheet.
8. 8
   Press down centers with thumb.
9. 9
   Bake in a 350° oven for 15 to 17 minutes.
10. 10
    Cool on a wire rack.
11. 11
    Just before serving, fill centers with preserves.
12. 12
    Makes 36.