Morgantha

Morgantha is an evil witch who sells pies in exchange for children.
From Adrian's 'Persons of Interest':
Her origins are unknown but what we do know is that she has been alive for the past four hundred years. A powerful hag, she sells pies to the people of Barovia which makes them addicted. An affliction more potent than Dusk Weed or Opium. Freek's parents traded him in for a belly full of the stuff. She and her (daughters?) now reside in the Windmill once owned by House Durst to the southeast of Barovia.