Preheat the oven to 375 degrees Fahrenheit. Use a serrated knife to cut 1 small loaf artisan bread in a crosshatch pattern, being careful not to slice it all the way through to the bottom.
In a small bowl combine ½ cup melted salted butter, 4 teaspoons minced garlic,2 tablespoons chopped fresh parsley, and 2 tablespoons grated parmesan cheese. Brush the butter inside of the bread, pulling it gently apart to brush it evenly on the outside and inside.
Tuck 2 ounces sliced mozzarella cheese and 2 ounces sliced cheddar cheese into the bread sections, filling the entire loaf. Place the bread on a large sheet of aluminum foil and wrap it up entirely.
Place the wrapped bread on a baking sheet and bake for 15 minutes. Unwrap the foil and bake for an additional 10-15, until the crust is crisp. Serve immediately.