3/4 c. butter, softened
1/2 c. firmly packed brown sugar
1 egg, separated
1/2 tsp. vanilla
1 1/3 c. unsifted flour
1/4 tsp. salt
1 c. finely chopped nuts
Jam or jelly

Preheat oven to 375 degrees. In mixing bowl, cream butter and sugar. Beat egg yolk (reserve white) and vanilla. Stir in flour and salt until well mixed. If desired, chill dough for easier handling. Shape dough into balls using slightly rounded teaspoonful of dough for each. Slightly beat egg white.

Dip balls into egg white, then roll in nuts. Place 1 inch apart on ungreased baking sheet. Press deep hole in center of each cookie with thumb. Bake 8 to 10 minutes or until lightly brown. Fill with jam or jelly.