Mix the egg whites, milk, vanilla, and cinnamon in a large bowl. Pour the mixture onto a plate (but one with sides so the mixture doesn't slosh). Dip the bread in, allowing the mixture to soak in both sides. Do this with each slice of bread.
Heat an electric skillet to 375 degrees fahrenheit. Spray it with cooking spray if needed. When it is hot, put the toast on and let it cook until one side is brown. When it is, flip the toast over. Do this with all the toasts.
When the toasts are the right color, turn the heat off and serve the toast with light syrup, fresh fruit, or a sprinkle of powdered sugar. Yummy!