Cheesy Baked Roast Beef Sliders with Caramelized Onions (Edit recipe)

Mayo spread

1. In a small bowl, combine the mayonnaise with the parmesan cheese, garlic powder, black pepper, and kosher salt. Whisk to combine and set aside.

Caramelized onions

1. Heat a skillet over medium heat on the stovetop with the butter until it completely melts and stops foaming.
2. Add the onions to the pan, along with the red wine vinegar, salt and pepper.
3. Saute for 10-12 minutes until they are softened and lightly caramelized.

Roast beef sliders

1. While the onions are cooking, preheat the oven to 350˚F.
2. Slice the Hawaiian rolls through the middle with a serrated knife so there is a top and bottom sheet of buns.
3. Place the bottom sheet, cut side up, in a lightly greased 9x13 baking dish.
4. Spread the mayo in an even layer over the rolls in the pan.
5. Loosely pile the thinly sliced roast beef over the mayo sauce and then top evenly with the caramelized onions.
6. Layer the provolone cheese slices on top of the onions and finish with the top sheet of rolls.
7. In a small skillet, heat the butter over medium-low heat with the garlic powder and dehydrated onions. Let the mixture simmer for 1-2 minutes until lightly browned and fragrant.
8. Pour the butter mixture over the top of the rolls, using a pastry brush to help distribute it evenly.
9. Cover the dish lightly with foil and bake in the preheated oven for 20 minutes. Remove the foil and let the sliders bake for an additional 10 minutes until light brown.