Store any leftover sliders in an airtight glass container in the refrigerator for up to 2 days. I do not recommend freezing the fully assembled sliders because the fresh lettuce and tomato slices will turn mushy when thawed. If you want to freeze the base, you can freeze the baked bread, chicken, and cheese layers for up to 1 month wrapped tightly in aluminum foil. To reheat the sliders, place them on a baking sheet in a 350°F oven for 8 to 10 minutes until warmed through. If the buns look like they are browning too fast, pull a piece of foil over the top. Add a fresh handful of shredded lettuce right before serving to restore that perfect signature crunch.