Mix the room temperature butter with sugar and vanilla sugar until creamy. Beat the eggs one by one and stir in. Mix in each egg well before adding the next. Add the jam, yoghurt and rum. Sift the flour mixed with baking powder and cinnamon over it and stir in.
Pour the dough into a greased and crumbled Gugelhupf tin and bake at 170 ° C for about 45 minutes. Make a chopstick test.