Preheat the oven to 350 degrees F. Line a large baking sheet with aluminum foil. Set aside.
In a small bowl, whisk melted butter, garlic and parsley.
With a serrated knife, slice bread diagonally into 1-inch diamonds (careful not to slice all the way through). Place on top of a large piece of aluminum foil.
Open up bread cracks with your fingers. Drizzle with melted butter and add pinches of shredded mozzarella. Wrap in foil, covering on all sides, and place on baking sheet.
Bake for 15 minutes, or until cheese has mostly melted. Open up foil and bake for another 5 minutes, or until crusty.
Notes
To make ahead: Refrigerate foil-wrapped bread overnight, or freeze for up to 1 month. Thaw before baking.Adapted from Handle the Heat