Tomato Vegetable Casserole

medium potato, peeled and cut into 1/2-inch pieces

medium yam, peeled and cut into 1/2-inch pieces

red bell pepper, seeded and cut into 1/2-inch pieces

carrots, peeled and cut into 1/2-inch pieces

olive oil

red onion, thinly sliced into rings

small or 1 large zucchini, cut crosswise into 1/4-inch-thick pieces

Salt and pepper

large ripe tomatoes, cut crosswise into 1/4-inch thick slices

grated Parmesan

dried Italian-style bread crumbs

Fresh basil sprigs, for garnish