Chicken & Zucchini Casserole

Name: Chicken & Zucchini Casserole
Cook time: 1 h
Total time: 1 h
Cuisine: American
Ingredients: 3 tablespoons butter, divided; 2 pounds boneless, skinless chicken breast, cut into 1-inch pieces; 2 large zucchini, cut into 1/2-inch pieces; 1 large red bell pepper, chopped; 4 cloves garlic, minced; 1 teaspoon Italian seasoning; 0.33333334326744 cup all-purpose flour; 1 cup no-salt-added chicken broth; 1 cup whole milk; 3 ounces reduced-fat cream cheese; 1.25 cups shredded part-skim mozzarella cheese, divided; 0.75 teaspoon ground pepper; 0.5 teaspoon salt