Pasta Shells with Chicken and Brussels Sprouts

INGREDIENTS

2 tbsp

cooking oil

3 tbsp

butter

boneless, skinless chicken breasts (about 1 1/3 pounds in all)

1 tsp

salt

1/2 tsp

fresh-ground black pepper

1/2

red onion, chopped

2 cloves

garlic, chopped

3/4 lb

fresh Brussels sprouts (or one 10-ounce package frozen), cut into quarters from top to stem end

1 cup

canned low-sodium chicken broth or homemade stock

1/8 tsp

dried red-pepper flakes

1 1/2 tsp

lemon juice

1/4 cup

chopped fresh parsley

1/3 cup

grated Parmesan cheese

1/2 lb

medium pasta shells