Thumbprint Cookies - cooking recipe

Ingredients

2 1/4 c. flour
1 c. butter or margarine, softened
1/2 c. packed brown sugar
2 eggs, separated
1 1/2 tsp. vanilla
1 1/2 c. walnuts, finely chopped
fruit preserves

Preparation

Beat butter and brown sugar until light and fluffy.
Beat in egg yolks and vanilla.
Stir in flour (half at a time), blending well.
Beat egg whites in a pie plate until foamy.
Sprinkle walnuts on waxed paper.
Roll dough into 1-inch balls, roll in egg white, then in walnuts to coat all over.
Place 2-inches apart on ungreased cookie sheet.
Press down in center of each with thumb to make a hollow.
Bake at 350\u00b0 for 12 minutes or until firm and lightly golden.
Cool completely on wire rack.
Spoon preserves into each hollow.