Preheat oven to 415 degrees F. Line a baking sheet with foil, dull side facing up. Trim asparagus of woody ends and rinse with water and pat dry with paper towels.
Drizzle oil over asparagus and season with garlic, salt and pepper, using clean hands to massage all over the asparagus. Arrange the asparagus on the baking sheet, leaving room between the stalks if possible.
Roast for 10 to 15 minutes, depending on the thickness of your asparagus, until they are crisp-tender, and a bright green color. Remove from oven and top with the shredded mozzarella cheese.
Turn the oven's broiler to high, and return asparagus to oven. Watch closely, and let cook for just 2 to 3 minutes, until the cheese is melted and bubbly. Enjoy!