Prepare a baking sheet with paper towels, set aside. 

Pound the chicken flat. Place 1 chicken breast in a large reusable storage bag with 1 tablespoon of water (this will keep the chicken breast from tearing. With a mallet or bottom of a small skillet, pound the chicken breast, from the center toward the outside edge, in all directions. This will even out the thickness and make the chicken cook evenly. Continue with remaining chicken breasts.

Season chicken with salt and pepper.

Place egg whites in a shallow container that will accommodate the chicken.

Place flour in the center of 1 piece of parchment and season with salt and pepper.

Place panko in the center of remaining piece of parchment and season with salt and pepper and add zest and thyme to panko.

Arrange the breading steps in order of: flour then egg whites and finally seasoned panko.

Heat 2 inches of evoo in a heavy bottom skillet, over medium heat until the oil sizzles when a piece of panko is dropped in.

Dredge a breast in flour, then egg white and finally in panko. Place in evoo and cook until browned on 1 side. Carefully turn over and brown the other side. Transfer browned chicken to prepared baking sheet. Continue with remaining chicken.

Squeeze lemon wedges over chicken before serving.