In a shallow pie dish or bowl add the eggs, milk, flour, sugar, salt, cinnamon, and vanilla. Whisk well to combine.
Place the cornflakes in a zip-lock bag. Seal and crush with your hands or a rolling pin until they are about the size of rolled oats. Pour the crushed cornflakes into another pie dish.
Dip each piece of bread into the milk and egg mixture and then press in the crushed cornflakes, flipping to coat both sides.
Melt butter in a skillet over medium heat. Add the bread and cook 2-3 minutes on one side until golden, and then flip and cook on the other side.