Step 1

Preheat the oven to 350 degrees Fahrenheit.

Step 2

Peel the onion. Slice the zucchini and mushrooms. Dice the onion and tomatoes.

Step 3

Layer half the vegetables in an 8-inch by 8-inch casserole or glass baking dish, mixing up the colors to create a festive look. Sprinkle the salt, garlic, basil, red pepper flakes and parsley over the veggies.

Step 4

Pour the olive oil over the veggies. Sprinkle half the cheddar cheese over the casserole as well.

Step 5

Layer the remaining vegetables. Bake for 20 minutes.

Step 6

Pull the casserole out of the oven, and sprinkle the remaining cheddar cheese over the top. Bake for another 15 minutes or until veggies are tender. Serve hot. Garnish with sprigs of fresh basil, if desired.