Prepare softened butter by leaving it at room temperature for 15 minutes until easy to spread.
Mix butter, minced garlic, parsley, salt, and pepper in a bowl until evenly combined.
Spread garlic butter across one side of each bread slice, covering the surface from edge to edge.
Place cheese between two bread slices with the buttered sides facing outward.
Heat a skillet over medium-low heat and cook the sandwich for 3β4 minutes until golden.
Flip carefully using a spatula and cook the second side for 2β4 minutes until crispy and melted.
Remove from heat and rest for 2 minutes before slicing.
Cut diagonally and serve warm with soup, salad, or dipping sauce.