Cinnamon schnapps and butterscotch schnapps both go great with warmed apple cider. The downside, I suppose, is that you really can’t have more than one mugful, or the cider does a number on your belly (and the surrounding atmosphere, if you know what I mean...)
I like cinnamon in cocoa, so that would be my drink of choice. Cinnamon schnapps ~~ well, that stuff, I drink neat.