Stir the water and brown sugar together until the sugar has dissolved.
Add the yogurt, dry yeast, flour, cardamom, cinnamon and a pinch of salt and knead everything together.
Add the butter and egg, knead into an even dough, cover with a cloth and leave to rise in a warm place for approx. 45 minutes.
Add the chocolate chips and knead carefully so that the chocolate chips are incorporated into the dough.
Divide the dough into 8 pieces and shape into small balls, depending on taste. Cover and leave to rise again in a warm place for 45 minutes.
Preheat the oven to 180 degrees fan. Mix an egg yolk with a tablespoon of milk and grease the rolls with it.
Bake the chocolate buns for approx. 25 minutes until golden brown.
8 servings