Preheat your oven to 475º Fahrenheit.
Place a chicken breast into a bag with a zip top. Using the flat side of a meat pounder, pound the chicken breast until it is approximately 1/2" thick. Remove the flattened chicken breast to a large plate. Individually pound the remaning chicken breasts and place them on the plate. Pat down both sides of each of the chicken breasts with paper towels to remove any excess moisture.
Add the egg yolk, egg whites, and water to a bowl and whisk together.
Line up the plates so you can easily move the chicken from the flour mixture, to the eggs, and then to the breadcrumbs.