This is the recipe of my mother, and I still think them the most delicious small cakes for tea, for picnic boxes, or to pass with fruits or ices.
1 cup sugar
3 eggs, separated
1 cup nuts
1 package dates
1/4 cup sour cream
1 teaspoon vanilla
1 cup flour
1 teaspoon baking powder
salt
Mix the egg yolks and sugar; add the other ingredients, the beaten egg whites last. Bake in a shallow pan for 30 minutes in a 350 degree F oven. Cut while warm into bars and roll in powdered sugar.