Cream of Spinach Soup

The autumn-planted spinach is about to bolt, so that's what's for supper tonight. Here's a delicious way to eat your greens!

1/2 cup onion, chopped
1 Tablespoon butter
1/2 # potatoes, peeled and cubed
1/2 # cauliflower florets
3/4 cup chicken broth
3/4 cup water
1 chicken bouillon cube
2 cups (packed) fresh spinach, chopped
5-oz can fat free evaporated milk
3-oz half-and-half (optional decadent ingredient)
1/2 teaspoon salt
1/4 teaspoon pepper
1/2 cup sour cream (or plain yogurt)
(chopped ham, kielbasa sausage, etc. - optional)

Saute onion in butter ~ 3 minutes. Add potatoes, cauliflower, chicken broth, water, bouillon. Bring to boil. Reduce heat to low, cover, and simmer ~ 20 minutes. Add spinach; cook 2 - 4 minutes. Puree all or part of soup in blender. Return to saucepan. Whisk in milk, salt, and pepper. Add ham or sausage, if desired. Bring to a simmer over low heat. Whisk in sour cream. Serve with some nice bread.