Prep the asparagus. Trim the asparagus, cutting or snapping off the woody ends. Arrange the spears on a rimmed baking sheet. Drizzle the asparagus with oil and toss with the kosher salt and coarse-ground pepper.
Bake. Roast the asparagus for about 10 to 12 minutes or until just tender. Remove the asparagus to a rack and set the oven to broil.
Broil. Top the asparagus with the mozzarella cheese and place it back in the oven. Broil for 1 to 3 minutes or until the cheese is melty and browned in places.
Plate and serve. Transfer the asparagus to a serving plate and finish with a light sprinkle of kosher salt and coarsely ground pepper.