Preheat your waffle maker to medium heat.
In a shallow bowl that will fit your bread, lightly beat the egg.
Whisk in the milk, sugar, vanilla, and cinnamon until combined.
Lightly spray the waffle iron. Dip the bread into the egg mixture on both sides, do not let it soak up too much, we are looking for a light yet even coating.
Place the piece of bread into the waffle maker and close the lid.
Cook for 3-5 minutes until golden brown and the bread starts to crisp.
Place the french toast on a wire rack over a sheet tray while you cook the rest of the slices, this will prevent the bread from getting soggy and making sure it is crisp.
Once all the bread is done, cut into sticks.
Serve with a dusting powdered sugar and maple syrup for dipping.