3 vegetable gratin network Recipes

unsalted butter, onion, chopped, yukon gold potatoes (about 1 lb), diced, frozen mixed peas and carrots, low-sodium ham, chopped (about 3/4 cup), whole-wheat flour, dried thyme, fat-free low-sodium chicken broth, low-fat (2 percent ) milk, panko breadcrumbs, chopped fresh parsley, kosher salt and freshly ground pepper

extra-virgin olive oil, plus more for dish, onions, thinly sliced, garlic, minced, kosher salt, fresh basil leaves , torn, chopped fresh thyme leaves, tomatoes, sliced into 1/4-inch rounds, zucchini, sliced into 1/4-inch rounds, yellow summer squash, sliced into 1/4-inch rounds, grated parmesan