Pork Chops With Mushroom Gravy

Name: Pork Chops With Mushroom Gravy
Ingredients: 4 1/2-inch-thick bone-in pork chops (2 to 2 3/4 pounds), fat trimmed; Kosher salt and freshly ground pepper; 2 tablespoons all-purpose flour; 1 1/2 tablespoons extra-virgin olive oil; 12 ounces cremini or white mushrooms, thinly sliced; 3 cloves garlic, thinly sliced; 1 bunch scallions, whites sliced, greens cut into 2-inch pieces; 1/2 cup low-sodium chicken broth; 2 tablespoons low-fat sour cream; 3/4 cup chopped fresh parsley; Cornbread, for serving (optional)