Sugar Top Cookies

This amazing bar cookie recipe is from my Great-grandma Brown, and I've never seen anything like it in any cookbook or on the internet. It is my mother's favorite.

Ingredients:

• 1 cup sugar
• 1/2 cup butter (one stick)
• 2 eggs; plus one egg yolk (reserve white)
• 1 1/2 cup flour
• 1/2 tsp baking powder
• 1 tsp vanilla
• 1/2 tsp salt

Topping:

• 1 cup brown sugar
• 1 egg white
• 1 tsp vanilla
• 1 cup chopped walnuts

Cream butter and sugar; beat in eggs one at a time. Add sifted dry ingredients. Spread into greased 13"x9" pan. Make a meringue by adding brown sugar to stiffly beaten egg white. Add vanilla, and spread over cookie mixture. Sprinkle nuts evenly over top, and bake at 350 degrees for 20 minutes. Cut into bars.