Orzo Chicken Soup

1/2 cup chopped onion
1 tablespoon butter or stick margarine
3 cans (14-1/2 ounces each) reduced-sodium chicken broth, divided
1/2 cup sliced carrot
1/2 cup chopped celery
1 cup cubed cooked chicken breast
1/2 cup uncooked orzo pasta
1/4 teaspoon pepper
Minced fresh parsley

In a large saucepan, saute onion in butter until tender. Add 1 can broth, carrot and celery; bring to a boil. Reduce heat; cover and simmer for 15 minutes.

Add the chicken, orzo, pepper and remaining broth; return to a boil. Reduce heat; cover and simmer for 25-30 minutes or until orzo and vegetables are tender. Sprinkle with parsley. Makes 4 servings.