1. Core and chop Gala apples into ½ inch cubes, and thinly slice white and green parts of green onions. Set aside.
2. Divide mixed greens, cooked barley, chicken, cheddar cheese, apples, green onion, and sunflower seeds between 4 plates or large bowls.
3. Prepare salad dressing by pouring balsamic vinegar and olive oil into a small mixing bowl. Add salt and pepper, whisk immediately prior to serving. Enjoy.