Preheat oven to 425 degrees F. Spray a large baking sheet with nonstick cooking spray; set aside.
Arrange asparagus in an even layer on baking sheet. In a small bowl, mix together olive oil, garlic, salt and pepper then drizzle over asparagus and toss to evenly coat.
Bake for 15 minutes, remove from the oven and top with shredded mozzarella.
Return to the oven and broil on high for an additional 3-4 minutes, or until cheese is melted and begins to turn golden brown.