2 sticks unsalted butter
1 c. sugar
1 tsp. vanilla
2 1/2 c. flour
Pinch of salt
21 tsp. Oetker baking powder
1 egg
2-3 tbsp. sour cream, if needed

Cream the butter until it is creamy, add the sugar and vanilla. Having mixed the flour, salt, and baking powder add this to the butter mix. Work in the egg and if it is a little dry, work in a little sour cream. Gently put this into an oblong pan. You can fill this with nuts, apricots, blueberries, or grated apples which have been mixed with 1 teaspoon flour, and a little sugar. Squeeze 1/2 of lemon over the apples. Bake about 35 minutes at 350 degrees. Cool, then cut in square, sprinkle confectioners sugar on top if you like this.