Depression Style Potato Soup

INGREDIENTS
4 medium potatoes, peeled and cubed
3/4 cup chopped onion
1 small carrot, chopped
1/4 cup chopped celery
1 1/2 cups chicken broth
3 tablespoons butter, cubed
3 tablespoons all-purpose flour
2 1/2 cups milk
1 tablespoon minced fresh parsley
3/4 teaspoon salt
1/2 teaspoon pepper
1 cup shredded Swiss cheese

DIRECTIONS
In a large saucepan, combine the potatoes, onion, carrot, celery and broth. Bring to a boil. Reduce heat; cover and simmer for 12-15 minutes or until vegetables are tender; lightly mash.
Meanwhile, in a small saucepan, melt butter; stir in flour until smooth. Gradually stir in milk. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir into potato mixture. Cook and stir until thickened and bubbly. Add parsley, salt and pepper. Remove from the heat; stir in cheese until melted