Use a blender or food processor to puree avocados until smooth.
Saute chopped shallots in olive oil until tender but not brown;set aside to cool.
In a large bowl, whisk together avocados with chicken stock, heavy cream and shallots until smooth. Stir in salt, pepper and nutmeg; adjust seasonings to taste.
Chill for at least half an hour before serving.
Garnish as desired.
prep and cook time does not incude refrigeration time.