Begin by slicing each chicken breast in half lengthwise to create four thinner cutlets. Using a meat mallet or rolling pin, gently pound the cutlets to an even thickness (about 1/4 inch). This ensures even cooking and tender meat.
Whisk together the kosher salt, garlic powder, and Italian herb blend in a shallow dish. Add the Italian dressing and place the chicken cutlets in the marinade. Let them marinate for at least 1 hour.
In a separate shallow dish, mix together the whole wheat breadcrumbs and grated Parmesan cheese. In another shallow dish, beat the egg.
One at a time, dip each marinated chicken cutlet into the beaten egg (allow excess to drip off). Coat evenly with the breadcrumb mixture.