These are the best sliders ever! I had to tote them to a family member's last night, so I cooked all 24 of the patties and put them on a baking sheet, topped with cheese and then and covered with foil. I sliced all the buns and put them a separate baking sheet covered with foil. I had previously caramelized chopped onions separately and put in a container. When I got there, I simply assembled the burgers with a schmear of onions and a just a little squirt of mustard (because we have Krystal here instead of White Castle and they use a dab of mustard!), covered with heavy duty foil and heated them in the oven for about 5-6 minutes. The buns remained soft, the cheese melted, and the little burgers were still moist. I served the pickle slices on the side because I didn't want them to get hot and wilted in the oven. Today for lunch, I reheated a couple wrapped in foil in the toaster oven. The buns got a tad toasty on this second reheat, but they were still delicious! Thank you for such a fun idea! (PS: Thinking like a former caterer, I think you could transport these for a picnic or tailgate by heating them up in foil packets and placing the hot packets in an insulated cooler)

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