Chicken Pot Pie Soup

1/3 c butter
1/3 c flour
1/3 c chopped onion
2 stalks celery
1/2 tsp salt
1/4 tsp pepper
1/2 tsp poultry seasoning
1 3/4 c chicken broth
2/3 c milk
2 c cooked chicken cut into cubes
1 c frozen peas and carrots
2 potatoes cubed

Heat butter over low heat until melted. Blend in flour, onion, celery, and seasonings. Cook over low heat, stirring constantly until mixture is smooth and bubbly, remove from heat, stir in broth and milk. Heat to boiling, stirring constantly. Boil and stir 1 minute. Stir in chicken, vegetables and potatoes. Cover and cook until potatoes are soft.