Broccoli-Cheese Soup

1 1/2 pound fresh broccoli
3 T butter
1/4 cup chopped onion
3 1/2 T flour
2 cups chicken broth
2 cups light cream
1 t salt
1/4 t nutmeg
1 1/2 c shredded cheddar cheese

Wash and chop broccoli. Cook in small amount of salted water until tender. Melt butter in heavy saucepan. Add onion and cook until clear. Stir in flour to make roux; slowly add broth and cream. Stir and cook until thickened. Add salt, nutmeg, and cooked broccoli. Add cheese, stir until melted, then serve.