Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
In a small bowl, combine the melted butter, minced garlic, parsley, salt, and black pepper. Set aside.
Open the can of biscuit dough and separate the dough into 12 equal pieces.
Flatten each biscuit piece slightly with your hands.
Place about 1 tablespoon of shredded mozzarella cheese in the center of each flattened biscuit.
Fold the edges of the biscuit dough over the cheese, pinching them together to seal the cheese inside.
Roll the dough ball gently in your hands to shape it into a round ball.
Place the cheese-filled balls on the prepared baking sheet, spaced about 2 inches apart.
Brush the tops of the dough balls generously with the garlic butter mixture.
If desired, sprinkle additional grated Parmesan cheese on top of each ball.
Bake in the preheated oven for 12-15 minutes or until the tops are golden brown and the cheese is melted.
Remove from the oven and allow to cool slightly before serving.