– 1 tablespoon extra-virgin olive oil plus 2 teaspoons, divided
– 2 pounds boneless skinless chicken breasts or thighs
– 1 teaspoon kosher salt
– 1/2 teaspoon ground black pepper
– 1 medium yellow onion, chopped
– 3 cloves garlic, minced
– 1 tablespoon balsamic vinegar plus 1/2 teaspoon, divided
– 1 can crushed tomatoes (28 ounces)
– 1 medium green bell pepper, chopped
– 8 ounces sliced baby bella cremini mushrooms
– 2 teaspoons Italian seasoning
– FOR SERVING: Whole wheat pasta, brown rice, polenta, rice, zucchini noodles, or baked and shredded spaghetti squash
– Chopped fresh parsley
– Freshly grated Parmesan cheese