Bird's Nest Cookies

0.5 cup butter
0.25 cup brown sugar
1 beaten egg yolk
1 cup flour
chopped nuts
1 slightly beaten egg white

Mix butter, brown sugar, and egg yolk and add 1 cup flour. Form into small balls and dip in slightly beaten egg white. Roll in chopped nuts and press in center. Bake at 350 degrees for 8 minutes. Remove and press centers again. Bake for 10 minutes more. Remove and press centers again.