Peel and core apples, cut into small cubes and sprinkle with lemon juice
Beat egg with sugar, vanilla sugar, cinnamon and salt. Add sour cream and oil and continue beating.
Sift flour with baking soda, add beaten eggs and apple cubes.
Cover a baking tray with baking paper. Place tablespoons of the batter on the tray. Bake 15-20 minutes in 360 degree oven (they should be lovely brownish on the top). Cool down and sprinkle with icing sugar if using.