Ingredients: * 2-1/2 cups uncooked bow tie pasta * 2 cups cubed cooked chicken breast * 2 celery ribs, thinly sliced * 1 can (11 ounces) mandarin oranges, drained * 1 can (2-1/4 ounces) sliced ripe olives, drained * 1/3 cup fat-free plain yogurt * 1/3 cup reduced-fat mayonnaise * 1/4 cup thawed orange juice concentrate * 1 tablespoon white vinegar * 2 teaspoons sugar * 1/4 teaspoon salt * 1/4 teaspoon ground mustard * 6 cups torn mixed salad greens * 1/2 cup cubed avocado Methods: 01.Cook pasta according to package directions; drain and rinse in cold water. In a large bowl, combine the pasta, chicken, celery, oranges and olives. 02. For dressing, in a small bowl, combine the yogurt, mayonnaise, orange juice concentrate, vinegar, sugar, salt and mustard. Pour over pasta mixture and toss to coat. 03.For each serving, spoon 1-1/3 cups pasta mixture over 1 cup of greens; top with about 1 tablespoon avocado