Turn to LOW and steep until wine is steaming but not boiling, about 1 hour.
Pour wine through a strainer into glasses.
Garnish with orange slices and a cinnamon stick, if desired.
Notes
If you want to keep your mulled wine warm once it's done cooking, turn your slow cooker to WARM and keep covered until ready to serve.Storing: Strain out spices and pour wine into a pitcher and cover with plastic wrap. It will keep for about 2 days in the fridge.