Pre heat oven to 180c (350f).
Slice the top off the bread rolls using a serrated knife and set these "lids" aside.
Using your fingers, scoop out the centre of the roll and reserve for another use (making your own breadcrumbs!).
Combine the melted butter (4 tbsp), crushed garlic (2 large cloves), salt (if using) and finely chopped parsley (1 tbsp if using) in a small bowl. Using a pastry brush, brush this butter mixture around the inside of the rolls, plus both sides of the lids you set aside earlier.
Sprinkle the grated parmesan onto the cut side of the lids (these will be garlic bread dippers) and around the inside of the rolls. Tilt the rolls slightly as you go, the parmesan will stick to the butter.
Place the bowls and lids (cut side up) onto a lined baking tray and bake for 20 minutes or until golden.