Preheat the oven to 190 ° C. Grease the muffin tray recesses or line them with paper liners. Mix the dry ingredients together in a bowl. In another bowl, whisk the egg and stir in the liquid ingredients. Then carefully fold in the flour mixture. Pour half of the batter into the molds. Then put 1 teaspoon of jam and a marzipan ball on the dough and fill up with the rest of the dough. Bake at 180 ° C on the middle shelf for 20-25 minutes.
Then let rest in the mold for about 10 minutes. Serve lukewarm if desired.