Grease a 9x13-inch baking pan with 2 tablespoons butter and line with parchment paper.
Using a serrated knife, slice the Hawaiian rolls in half horizontally, keeping the rolls attached. Place the bottom half of the rolls in the prepared pan.
1 12-count packaged Hawaiian/soft rolls
Layer with 6 slices of cheese, roast beef, French-fried onions, the remaining 6 slices of cheese, and then place the top half of the rolls on top.
1 pound roast beef, 1 cups French fried onions, 12 slices provolone cheese
In a microwave-safe bowl, melt butter. Add 1 tablespoon of au jus mix and the remaining ingredients for the butter mixture. Whisk to combine.
4 tablespoons unsalted butter, 1 tablespoon au jus mix , 1 teaspoon Worcestershire sauce, 1 tablespoon everything bagel seasoning
Spread the butter mixture evenly over the top and sides of the rolls, using about ¾ of the mixture. Reserve the rest for serving.
Bake the sliders uncovered in the air fryer at 160ºC (320°F) for 10 minutes, or until the cheese is melted and the tops of the rolls are golden brown.
Remove the sliders from the air fryer and cut into squares along the roll divisions with a sharp knife.