Step 1

Preheat the oven to 400 degrees F.

Step 2

Toss the potato, yam, bell pepper, carrots, and 2 tablespoons of olive oil in a 13 by 9 by 2-inch baking dish to coat. Sprinkle with salt and pepper and toss until coated. Spread vegetables evenly over the bottom of the pan.

Step 3

Arrange the onion slices evenly over the vegetable mixture. Arrange the zucchini over the onion. Drizzle with 2 tablespoons of oil. Sprinkle with salt and pepper. Arrange the tomato slices over the zucchini.

Step 4

Stir the Parmesan and bread crumbs in a small bowl to blend. Sprinkle the Parmesan bread crumbs over the vegetables in the baking dish. Drizzle with the last tablespoon of olive oil.

Step 5

Bake uncovered until the vegetables are tender, and the topping is golden brown, about 40 minutes. Garnish with fresh basil sprigs, if desired.