Cut potatoes into eighths, cut onions into eighths. Coarsley chop the green onions. Add along with the garlic to the butter in a heavy 3-quart saucepan. Add onion to butter and saute for 1 minute Add the potatoes and pour in the broth.
Simmer for 20 minute or until potatoes are tender.
Puree soup in food processor or blender in batches that will suit the size of the appliance you are using.
Add cream, milk, salt, pepper and nutmeg to soup. Chill if served cold, reheat to servign temperature if served hot.
Garnish servings of hot soup with croutons, cold soup chopped chives.