Beat together the eggs, cinnamon, sugar, and milk. One slice at a time, dip bread into egg mixture until soaked all the way through.
Preheat skillet and spray with cooking spray or melt butter in the pan.
Place slices of soaked bread in preheated pan and cook over medium heat until centers are firm and no egg is visibly uncooked.
Serve quickly with warm maple syrup. Enjoy!