1 cup butter
1 cup white sugar
2 cups flour
1/2 teaspoon ground cinnamon
1 egg yolk
1 egg white
1/2 cup finely chopped walnuts (pecans work just as well)
Cream the butter and sugar. Add the egg yolk and beat thoroughly. (This should be very creamy.) Add the flour and cinnamon and mix well.
Spread thinly on 1 1/2 cookie sheets. Press down mixture with fingers, then score with a fork. Brush on a film of egg white mixed with a little water. Sprinkle the nuts over the top.
Bake for 30 minutes at 300° F. Remove from oven and cut into squares or oblongs. When cold, remove from cookie sheet.