Add apple cider and brown sugar to a 3-qt. slow cooker; stir until sugar dissolves. Add cinnamon, cloves, and allspice. Place orange slices on top. Cover and cook on low for 2-3 hours or until warmed and fragrant.
Use a strainer or slotted spoon to strain out the spices as you pour into heat-proof cups to serve.
Tip: Serve with our Ham and Cheese French Toast Casserole on Martin’s Cinnamon Raisin Butter Bread!