Thumbprint Cookies

Ingredients

• 1 cup butter
• 2 eggs, separated
• 1/2 teaspoon vanilla
• 1/2 cup brown sugar
• 2 cups flour
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 cups chopped walnuts
• jelly

Directions

1. Cream butter and sugar. Add vanilla.
2. Beat in egg yolks.
3. Sift together flour, soda and salt and add to sugar mixture.
4. Form into balls the size of a walnut, dip in slightly-beaten egg whites, and roll in chopped nuts.
5. Place on a greased cookie sheet and press down slightly in the center with your thumb.
6. Bake at 350 degrees for 8 minutes.
7. Remove from oven and press down in center again.
8. Bake another 10 minutes.
9. Cool. 
10. Just before serving, put a dab of jelly in the center of each cookie. 

Courtesy of food.com