how long to cook asparagus in oven
1 Place the asparagus into a mixing bowl, and drizzle with the olive oil. 2  Toss to coat the spears, then sprinkle with Parmesan cheese, garlic, salt, and pepper. 3  Arrange the asparagus onto a baking sheet in a single layer. 4  Bake in the preheated oven until just tender, 12 to 15 minutes depending on thickness.irections. Prep. Cook. Ready In. 1  Preheat an oven to 425 degrees F (220 degrees C). 2  Place the asparagus into a mixing bowl, and drizzle with the olive oil. 3  Toss to coat the spears, then sprinkle with Parmesan cheese, garlic, salt, and pepper. 4  Arrange the asparagus onto a baking sheet in a single layer.