Measure flour into a large mixing bowl. Slowly whisk in the milk. Whisk in the salt, eggs, cinnamon, vanilla extract and sugar until smooth.
Heat a lightly oiled griddle or frying pan over medium high heat.
Soak bread slices in mixture until saturated. Cook bread on each side until golden brown.
How to Freeze French Toast Now that you've made your French Toast, let the slices cool on a rack for 10 minutes. Lay them in a single layer on a baking tray lined with wax paper. Freeze for a few hours and transfer them to a freezer quality bag. Reheat the French Toast by microwaving for 30-60 seconds (watch it carefully) or put it in a toaster.