Mix the flour, baking powder, baking soda and oatmeal in a bowl.
Mix the eggs, sugar, butter, vanilla sugar and sour cream in another bowl. Stir in the flour mixture and carefully fold in the well-drained aronia berries. Grease the muffin tin or use molds. Pour the batter evenly into the wells. Bake in the oven at 180 ° C for 20-25 minutes.