Wash and core apples.
Mix together butter, brown sugar, cinnamon and apples.
Stuff core of apples with butter mixture.
Place in a slow-cooker. Cover and cook 3 to 4 hours on high or until apples are tender.
Serve warm. Spoon lots of juice over the apples. Serve with whipped cream or vanilla ice cream. Or both. Or neither. You're in charge.