2 boneless, skinless chicken breast halves
2 tablespoons oil
1 large onion, finely chopped
1 tablespoon minced garlic
1-3/4 cups (12 ounces) uncooked orzo pasta (orzo is a tiny, rice-shaped pasta)
2 cups broccoli flowerets, cut into bite-size pieces [or 1 package (10 ounces) frozen broccoli, thawed]
2 cans (14-1/2 ounces each) reduced sodium chicken stock or broth
2 ears fresh corn, kernels cut from cobs [or 1 package (10 ounces) frozen corn, thawed]
1/4 teaspoon freshly ground black pepper
3/4 cup freshly grated Parmesan cheese