Nut Cake 

1 cup soft butter/margarine
2 tbsp. baking powder
1 3/4 cup sugar
3/4 tsp. salt
1 tsp. vanilla
3/4 cup milk
3 eggs and one egg yolk
1 cup finely chopped nuts
3 cups cake flour 

Cream butter; gradually add sugar and beat until light and fluffy. Add vanilla. Add eggs and yolk, one at a time, beating thoroughly after each addition. Add sifted dry ingredients alternately with milk, beating until smooth. Fold in nuts. Pour into 9 inch tube pan, lined on the bottom with paper. Bake at 375 F. For 1 hour or until done. Cool in pan 10 minutes. Remove to rack. Dust with powdered sugar, or serve plain.