cheeseburger soup recipe

**Ingredients:** - 1 pound ground beef - 1 small onion, chopped - 1 cup shredded carrots - 1 cup diced celery - 4 cups diced potatoes (about 4 medium potatoes) - 3 cups chicken broth - 2 cups milk - 1/4 cup all-purpose flour - 2 cups shredded cheddar cheese - 1/2 cup sour cream - 1/4 cup butter - Salt and pepper to taste - Optional toppings: crumbled bacon, chopped green onions, extra shredded cheese