Cream the butter and sugar well Add egg yolks and beat well about 5 minutes Sift flour salt and baking powder together and add in 3 parts to creamed mixture blending it well Add vanilla Clean beaters and beat egg whites in another bowl until stiff but not dry
Pour on top of the batter and with spatula or rubber scraper fold in gently
Grease a 9 x 13-inch pan Dust with flour
Pour in batter and spread to corners
Sprinkle with walnuts and bake at 350 for 25 to 30 minutes
Lightly dust with powdered sugar while warm Cool and cut with a serrated round cookie cutter so you will have half moon shaped little cakes