The batter leans on quark — a fresh curd cheese, not a sweetener — so the sugar you taste comes entirely from the cinnamon coating added after frying, not from the cakes themselves.
Mashed potato is worked into quark, egg, and a little flour and cinnamon, then spooned into a hot pan and fried into small, golden discs. Saxon market stalls and street-fair stands serve them dusted with sugar and cinnamon, often with a side of stewed apple or plum sauce.