Preheat your oven to 350°F (175°C). Line a baking sheet with foil for easy cleanup.
Without pulling the rolls apart, slice the entire block in half horizontally to make a top and bottom slab.
Place the bottom half of the rolls on your prepared baking sheet.
In a small bowl, stir together the melted butter, minced garlic, parsley, salt, and pepper.
Brush half of the garlic butter over the bottom layer of rolls.
Sprinkle mozzarella and parmesan cheeses evenly over the bottom layer.
Place the top half of the rolls back on. Brush with remaining garlic butter.
Cover loosely with foil and bake for about 10 minutes, then uncover and bake another 5 minutes until the top is golden and the cheese is melty.
Slice, serve, and try not to eat them all in one go.