In a large dish, beat the eggs, cinnamon and stir in the milk.
Set the slices of panettone to soak for about 5 minutes on each side. Most of the liquid should be absorbed.
In a skillet, heat a pat of butter to coat the pan. Over medium heat, fry the slices of panettone until golden brown on both sides. Serve with real maple syrup or a dollop of whipped cream.