I don't think a main dish can get much more simple than this. It was gone so fast I don't even have pictures to post.
Chicken breasts or tenders - marinate for at least an hour in prepared ranch dressing (I used Hidden Valley and let it sit overnight, but any kind will do).
Dip marinated chicken in shredded parmesan cheese to coat.
Bake at 350 for 30 minutes, or until juices run clear. Easy as that. The sauce is yummy with a side of roasted red potatoes.