In a small mixing bowl, combine softened unsalted butter, minced garlic cloves, grated Pecorino Romano cheese, and chopped fresh parsley. Mix thoroughly until you achieve a smooth, creamy consistency.

Take your chosen slices of bread and generously spread the garlic butter mixture on one side of each slice.

Place a slice of bread butter-side down on a cutting board. Layer two slices of your favorite melty cheese on top. Then, place another slice of bread on top, butter-side up.

Preheat a skillet over medium heat. Carefully place the assembled sandwich in the skillet.

Using a spatula, gently flip the sandwich over to cook the other side.

Once cooled for a minute, slice in half diagonally and serve warm.