I'm not exactly sure what a Nightmare after lunch cheesecake is....
But, when the Haunted Mansion is done up for the holidays, the French Market (the restaurant next door) usually has a few menu items themed to Nightmare Before Christmas. I can't remember what they had this year, but last year they had a Bowl of Bones which was BBQ ribs and mashed potatoes served in Zero's dog bowl. You actually got to keep the bowl. The desserts usually have spider or skeleton decorations to keep with the theme.