Preheat the oven to 350°F. Slice the rolls in half, separating the tops from the bottoms.
Place all the bottom halves into a 9x13 baking pan, ensuring they are snug against each other. Set the tops aside.
Spread a thin layer of mayonnaise over the bottom rolls.
Top each roll with 1 to 2 slices of roast beef, folding them as needed to fit.
Place the provolone cheese evenly over the beef and gently press the top halves onto the cheese.
Melt the butter in a small saucepan over medium heat.
Stir in the Dijon mustard, barbecue sauce, poppy seeds, and Worcestershire sauce, and heat this mixture until it begins to boil, then remove from heat.
Pour the warm sauce over the stacked sliders evenly.
Cover the dish with aluminum foil and place it in the oven to bake for 20 minutes.
Remove the foil and bake for an additional 5 to 10 minutes until the tops are lightly browned and the cheese is melted.
Enjoy the warm, cheesy sliders right out of the oven!