In a 2-quart or 3-quart Crock Pot, stir together the milk, coffee, sugar, vanilla, and mint. Cover and cook on low for 2 hours, or until steamy-hot. Don't let it boil! Flip switch to warm or watch closely once it's hot. Taste and add additional sugar and/or mint as you wish. Ladle into glasses and top with whipped cream and crushed candy canes. Add a peppermint stick and you're good to go!