Preheat the oven to 350°F and lightly grease a 9-by-13-inch baking dish.
Combine the shredded chicken, mayonnaise, cream cheese, Dijon mustard, garlic powder, onion powder, salt, and black pepper in a bowl.
Keep the slider rolls attached and slice the entire slab horizontally.
Place the bottom half of the rolls in the prepared baking dish.
Arrange the provolone cheese over the bottom rolls.
Spread the chicken mixture evenly over the cheese.
Add the cheddar cheese over the chicken and replace the top half of the rolls.
Combine the melted butter, Worcestershire sauce, garlic powder, parsley, and poppy seeds.
Brush the butter mixture evenly over the rolls.
Cover the dish loosely with foil and bake for 15 minutes.
Remove the foil and bake for another 8 to 10 minutes, or until the tops are golden and the cheese is melted.
Rest for five minutes, separate the sliders, and serve warm.
