Slow Cooker Chicken Noodle Soup

5 cups chicken broth

1 (10.75 oz) can 98% fat free cream of chicken soup

1/2 of an onion, finely chopped

2-3 celery stalks, finely chopped

4 large carrots, finely chopped

1/2 cup green onions, sliced

1 (15 oz) can corn, drained

1/2 tsp garlic powder

Salt and Pepper to taste

1 1/2 cups egg noodles, uncooked

2 cups cooked chicken, chopped or shredded (or 2 cans canned cooked chicken)