3 low potato onion tomato gratin Recipes

nonstick cooking spray or vegetable oil, onion, peeled,cut in half and thinly sliced, salt & freshly ground black pepper, red potatoes, peeled and sliced 1/8 inch thick, fresh thyme leaves or 1 tsp dried thyme, divided, ripe tomatoes, cored and cut into thin slices, garlic, peeled,thinly sliced, olive oil, white wine, vegetable broth (or more if needed), unsalted butter , optional

sliced red potato (about 3 lb), low-fat milk, all-purpose flour, butter or stick margarine, sliced green onions, curry powder, garlic clove, crushed, plain low-fat yogurt, tomato sauce, salt, grated fresh parmesan cheese