Beat the egg until frothy. Add sugar, margarine, vanilla sugar and milk and stir well. Mix the flour, baking powder and baking soda in another bowl and add to the egg mixture. Only stir until the dry ingredients are just moist. Pour the batter into the greased hollows of a muffin tin. Spread 1 teaspoon of jam on each.
Bake the muffins in the preheated oven at 175 ° C to 200 ° C for about 20 minutes