Make-ahead: assemble, cover, and refrigerate up to 24 hours, then bake as directed (add 2–3 minutes if cold). Storage: refrigerate leftovers up to 3 days; reheat wrapped in foil at 350°F (175°C) for about 10 minutes. Freezing: wrap each slider in parchment then foil and freeze up to 1 month; thaw overnight and reheat in the oven. Swaps: turkey bacon works; try pepper jack for heat.