It's all in the spice
Exotic spices like aniseed, cardamom, nutmeg, vanilla or cinnamon have always made Christmas biscuits a special treat. If you like Zimtsterne, or cinnamon stars, then make sure they have been made using Ceylon-cinnamon. It might be slightly more expensive, but contains less of the harmful coumarin. But unless you plan to eat tons of them, cinnamon is unlikely to affect you at all.