Grease a 12 cup muffin pan. Chop the berries into small pieces, defrost frozen ones beforehand.
Beat the margarine, sugar, vanilla sugar, eggs, salt and the buttermilk with a hand mixer until frothy. Mix the flour with the baking powder and baking soda and stir into the egg mixture. Then fold the berries into the batter.
Then fill the molds and bake in the preheated oven at 200 ° C top / bottom heat for 20-25 minutes.
Take the muffins out of the molds after 5 minutes, otherwise they will collapse.