Despite the flop, they're back in one market as McDonald's continues giving more power to regions to decide what works in each market as part of its ongoing turnaround effort.
"Mighty Wings performed very well in the Detroit market, so they brought them back for an encore by popular demand. At this time, Detroit is the only market that has chosen to bring the Mighty Wings back as a local market menu option," said Kristen Wells, a McDonald's spokeswoman in an email.
Read MoreMcDonald's quietly changes its Quarter Pounder size
In its latest iteration, McDonald's toned down the spice level by 25 percent even as rival Burger King bets on heat with its spicy chicken fries launch earlier this month.
Pricing is determined by franchisees, but prices at locations CNBC called ranged from about 89 cents to about a buck each, depending on the size ordered.