Melt the butter or margarine in a saucepan. Add milk and let cool down to 37 ° C (lukewarm). Dissolve the yeast in it.
Mix the egg and sugar. Add to the liquid together with salt, cardamom and flour and work into a smooth dough. Cover and let rise for 30 minutes.
Knead again on a floured work surface, shape into a roll and divide into 16 equal pieces. Shape these into round buns and place on a baking sheet lined with baking paper. Let rise for another 40 minutes.
Bake in the preheated oven on the middle rack at 220 ° C for about 10 minutes.
Let the boller cool down on a wire rack.
Can be frozen and reheated briefly in the oven for breakfast.