In a small bowl, combine the softened butter, garlic powder, and dried parsley until the mixture is well blended.
Spread the garlic butter mixture evenly on one side of each slice of bread, ensuring it reaches the edges.
Place two slices of bread butter-side down in a skillet and distribute half of the cheese evenly on each. Then, top with the remaining slices of bread, butter-side up.
Heat a skillet over low heat and cook the sandwiches for 4–5 minutes on each side or until they are golden brown and the cheese has melted.
Remove the sandwiches from the skillet, slice them, and serve immediately.