French Onion Chicken

medium yellow onions, thinly sliced into rings

butter

plus 3 tablespoons beef broth, divided

boneless skinless chicken breasts, pounded to even thickness

oil

salt and pepper,

Italian blend herbs/Italian seasoning (OR ¼ teaspoon dried basil + ¼ teaspoon dried thyme + ½ teaspoon dried oregano)

flour

slices provolone cheese

slices swiss cheese

shredded parmesan cheese

fresh thyme or parsley and cracked black pepper for topping (optional)