01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - Without separating the individual rolls, slice the block of Hawaiian rolls horizontally with a serrated knife to create top and bottom halves.
03 - Set the bottom halves of the rolls on the prepared baking sheet. Distribute the sliced cheddar cheese evenly over the bread and add ham or turkey if using.
04 - Place the top halves of the Hawaiian rolls atop the cheese and any optional fillings.
05 - Combine the melted butter with mustard, honey, and garlic powder if desired. Evenly brush this mixture over the tops of the rolls using a pastry brush.
06 - Bake for 10 to 15 minutes, until the cheese is fully melted and the tops are golden brown.
07 - Allow to cool slightly for 2 minutes. Cut into individual mini sandwiches and present while warm.