Uncle Al's Sausage and Peppers Casserole

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1/4 cup olive oil

2 pounds fresh turkey sausage (about 8 links), cut in 1/2

1 medium red onion, quartered and separated

1 red bell pepper, cored, seeded, and cut into 1- inch-wide strips

1 green bell pepper, cored, seeded, and cut into 1-inch-wide strips

1 yellow bell pepper, cored, seeded, and cut into 1- inch-wide strips

1 pound green beans, ends trimmed and halved

1 (14-ounce) can no-sugar-added diced tomatoes

3 cloves garlic, chopped

2 tablespoons chopped basil leaves, plus some for garnish

1 teaspoon dried oregano

1/4 teaspoon crushed red pepper flakes

1/4 teaspoon freshly ground black pepper

8 ounces button mushrooms

4 marinated hot cherry peppers, optional

Shaved Parmesan, for garnish