how long cook asparagus
1 Place the asparagus into a mixing bowl, and drizzle with the olive oil. Toss to coat the spears, then sprinkle with Parmesan cheese, garlic, salt, and pepper. Arrange the asparagus onto a baking sheet in a single layer.  Bake in the preheated oven until just tender, 12 to 15 minutes depending on thickness.