Toast your frozen waffles for about 30 seconds - just enough to thaw them so they absorb the French toast batter.
In a bowl with a fairly flat bottom, whisk together the egg, milk, cinnamon, and vanilla extract.
Place the waffles flat in the dish. Swirl the waffle around in the egg mixture so it soaks it up. Flip the waffle and soak the other side. Probably 20-30 seconds each side - but not too long or they’ll get too soggy.
Place in hot skillet with a little oil or melted butter, heat for 2-3 minutes per side
Air Fryer Instructions
Place in air fryer at 360 degrees for 6-7 minutes - flipping halfway thru