Fast food chains have been seeing fewer customers lately. There’s likely more than one reason for the current sales slump, but inflation and economic jitters from low—and middle-income consumers seem to be mostly to blame.

Lower same-store sales drive chains like McDonald’s to get creative to prime the slumping sales pump. So it’s little surprise that the Clown Prince of Hamburgers is experimenting with “grown-up” Happy Meals to entice consumers again by tapping into McDonaldland nostalgia.

The adult Happy Meal concept, which McDonald’s last tried out in March as part of a tie-in promotion with the Minecraftfilm, features full-size meal combos, special packaging, and collectables designed to appeal to adults rather than children.