These sliders are so easy to assemble, and you can customize them to your favorite meat and cheese, although the combination of ham and Swiss is not to be missed! (See recipe notes for variations). Make them ahead for an easy bake-and-serve dish. Hawaiian sweet rolls are widely available and one 12 oz. package fits perfectly into a 9x9 inch dish. If you’re looking for a less sweet options, the use brioche slider rolls, which can be found at most grocery stores in the bakery section.
Cut the rolls in half horizontally without separating them.
In a small bowl, whisk together the horseradish cream sauce and mayo until thoroughly combined. Spread the mixture over the cut side of the roll bottoms. Place the roll bottoms into a 9x9-inch baking dish with deep sides.
Layer ham evenly over the horseradish mixture, followed by the Swiss cheese. Replace the roll tops.
Melt the butter in a skillet over medium-high heat. Add the onions and cook while stirring, until the onion is tender and translucent. Stir in the brown sugar, mustard, poppy seeds, Worcestershire sauce, and garlic powder. Stir until the sugar is melted, about 1 minutes.
Pour the mixture over the rolls. Cover with foil and refrigerate overnight. (See recipe notes for longer storage).
Preheat the oven to 350F.
Bake the rolls covered in the foil for 25 minutes. Then uncover and bake until golden brown and shiny on top, about 5-7 minutes more.
Serve warm or at room temperature.
Notes
Make 2+ Days Ahead: If you need an even longer head start on these sliders, then assemble the sandwiches, cover and refrigerate, but do not add the buttery dressing. Dressed, these can become soggy over more than a couple of days in the refrigerator. Make the dressing and pour over the rolls the day before serving and refrigerate. Or, just do it the day of serving (it only takes about 5 minutes to cook!).Switch up the flavors!
Spicy Chipotle: Use chipotle mayo instead of the horseradish sauce mixture, use deli turkey instead of ham, and add pepper jack cheese instead of Swiss. .
Southern BBQ: Keep the horseradish sauce, but add some barbecue sauce to it for a tangy kick. Use pulled pork from your favorite BBQ joint (or grocery store), cheddar cheese instead of Swiss, and serve these with a side of cole slaw.
Cuban-Inspired: (Tampa Cuban) Coat roll bottoms with a thin, even layer of mustard instead of horseradish sauce, and keep the ham, but add a layer of Genoa salami. Add slices of dill pickles and Swiss cheese.
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