Flatten the chicken breast by pounding using a meat tendering tool. Season the chicken with salt and pepper. Grill for 5 to 7 minutes per side depending on the thickness. Remove from the grill and let the chicken rest for 10 minutes. Chop. Set aside.
Prepare the salad by combining the lettuce hearts, croutons, peperoncini, Parmesan Cheese, Caesar salad dressing, and grilled chicken. Toss.