01 - Preheat your oven to 350°F. Line a baking sheet with parchment paper for easy cleanup.
02 - Without separating the rolls, cut the entire block of Hawaiian rolls in half horizontally to create a top and bottom layer.
03 - Place the bottom half onto the prepared baking sheet. Evenly layer the mozzarella and cheddar cheeses over the bottom half of the rolls.
04 - Place the top half of the rolls over the cheese.
05 - In a small bowl, mix the melted butter with garlic powder. Brush the butter mixture liberally over the tops of the rolls.
06 - Sprinkle with chopped parsley and Parmesan cheese, if using.
07 - Bake for 12–15 minutes, or until the cheese is melted and the tops are golden brown.
08 - Remove from oven. Let cool for 2 minutes, then separate into individual rolls using a sharp knife. Serve warm.