Creating delicious Grilled Cheese Hawaiian Rolls is simple if you follow these steps:

1. Preheat the Oven: Begin by preheating your oven to 375°F (190°C).
2. Prepare the Roll Base: Without separating the rolls, slice the entire pack of Hawaiian rolls in half horizontally.
3. Mix Butter and Seasonings: In a bowl, combine softened butter, garlic powder, dried parsley, salt, and pepper. Mix until well blended.
4. Spread Butter Mixture: Spread the butter mixture generously over the cut sides of the rolls.
5. Add Cheese: Sprinkle half of the cheddar and mozzarella cheese on the bottom half of the rolls.
6. Layer with More Cheese: Add the remaining cheese on top.
7. Top with Roll Top: Place the top half of the rolls over the cheese layer.
8. Bake: Place the assembled rolls on a baking sheet and bake in the preheated oven for 12-15 minutes or until the cheese is melted and the top is golden brown.
9. Slice and Serve: Remove from the oven, let them cool for a minute, and then slice into individual rolls.
10. Enjoy: Serve warm and enjoy the gooey, cheesy goodness!

These steps will guide you in making the most incredible Grilled Cheese Hawaiian Rolls that will be a hit at any gathering.