Fresh Cream of Whatever Soup

1 tsp. finely chopped onion
2 T. butter
2-3 T. flour
1 tsp. salt
1/4 tsp. pepper
1 C. diced chicken, diced sautéed celery, sliced sautéed mushrooms, etc.
3 C. chicken stock
1 C. milk or cream

Sauté the onion in butter till transparent. Blend in the flour, salt and pepper. Stir over medium heat until smooth and bubbly. Then stir in the chicken (or other ingredient). Bring to a boil for a minute, stirring constantly. Remove from heat. Gradually stir in the chicken stock and then the milk or cream. Heat to serving temperature.