01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - Without separating the rolls, slice the entire block of Hawaiian rolls in half horizontally using a serrated knife.
03 - Place the bottom half on the prepared baking sheet. Layer evenly with cheddar and mozzarella cheese slices.
04 - Place the top half of the rolls back on to form a sandwich.
05 - In a small bowl, combine melted butter, garlic powder, parsley, and sea salt.
06 - Brush the butter mixture generously over the tops of the rolls.
07 - Cover loosely with foil and bake for 10 minutes.
08 - Uncover and bake an additional 5 minutes, or until the cheese is fully melted and tops are golden brown.
09 - Remove from oven, let cool slightly, then separate into individual mini sandwiches. Serve warm.