2 egg whites
1/2 cup sugar
1 tsp vanilla
6 oz pkg chocolate chips
1/2 cup chopped nuts (optional)

Preheat oven to 350 degrees. Beat egg whites to soft peaks; continue beating and add sugar slowly until stiff peaks form. Stir in remaining ingredients. Drop by teaspoonsful onto greased cookie sheet. Place pan into oven, then turn off heat. Allow cookies to set in oven for at least 3 hours or overnight.