Preheat oven to 375°F (190°C).
Slice the block of slider rolls in half horizontally and place the bottom half in a 9x13 inch baking dish.
Place one cooked chicken nugget on each roll bottom.
Spoon approximately one tablespoon of marinara sauce over each chicken piece.
Distribute the shredded mozzarella cheese evenly over the sauce and chicken.
Place the top half of the rolls back onto the sliders.
In a small bowl, combine the melted butter, garlic powder, dried parsley, and dried oregano.
Brush the garlic butter mixture evenly over the tops of the rolls and sprinkle with grated Parmesan cheese.
Cover the dish with aluminum foil and bake for 10 minutes.
Remove the foil and bake for an additional 10 minutes until the cheese is fully melted and the roll tops are golden brown.