Ingredients
-2 tablespoons cooking oil-3 tablespoons butter
-4 boneless, skinless chicken breasts (about 1 1/3 pounds in all)
-1 teaspoon salt
-1/2 teaspoon fresh-ground black pepper
-1/2 red onion, chopped
-2 cloves garlic, chopped
-3/4 pound 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 teaspoon dried red pepper flakes