Preheat the oven: Set it to 350°F (175°C). Line a 9x13-inch baking dish with parchment or lightly grease it.
Split the rolls: Without separating the individual rolls, slice the entire slab horizontally to make a top and bottom. Place the bottom half in the baking dish.
Make the chicken filling: In a large bowl, combine shredded chicken, mozzarella, cheddar, cream cheese, mayonnaise, hot sauce, green onions, garlic powder, onion powder, smoked paprika, salt, and pepper.
Mix until evenly coated and creamy.
Assemble the sliders: Spread the chicken mixture evenly over the bottom half of the rolls. Place the top half of the rolls over the filling and press gently.
Make the butter topping: Stir melted butter with Worcestershire and a pinch of garlic powder. Brush generously over the tops of the rolls.
Sprinkle with sesame or poppy seeds if using.
Bake: Cover the dish loosely with foil and bake for 15 minutes. Remove foil and bake another 8–10 minutes, until the tops are golden and the cheese is melted.
Rest, then slice: Let the sliders rest for 5 minutes so they set. Use a serrated knife to slice into individual pieces.
Garnish with parsley if you like.
Serve: Enjoy warm with simple sides like a green salad, coleslaw, or roasted veggies.