Chicken and Rice Casserole

INGREDIENTS

Cooking spray or 2 tsp. olive oil

1 cup

chopped onion

bone-in chicken breast half, skinned

1/2 tsp

black pepper, divided

1 14 ounce can

fat-free, less-sodium chicken broth

1 tbsp

butter

zucchini, halved lengthwise and thinly sliced

yellow squash, halved lengthwise and thinly sliced

2 cups

cooked long-grain white rice

1 tsp

minced fresh rosemary

1 1/2 tbsp

all-purpose flour

1 1/2 cups

2% reduced-fat milk

1/2 cup

grated fresh pecorino Romano cheese, divided

1/4 tsp

salt