Beat the eggs and milk in a shallow bowl, then add the vanilla, cinnamon and combine.
Cut the panettone slices in half or quarter, then dunk them in the egg mixture for a minute. Turn them over to soak up even more custard for another minute or so.
Meanwhile, heat some butter or oil in non-stick frying pan. Add the panettone slices to the pan and fry them for about a minute until they're browned. Turn them over and fry them on the other side until golden brown.
Remove them to a plate, lined with kitchen paper towel, then make a second batch of French toasts, repeating the above steps.
Serve them with maple syrup or icing sugar & compote of your choice.