Heat oven to 350 F
Cut white bottoms of asparagus and discard. (This part very fibrous and therefore not tender enough to enjoyably eat.)
Put asparagus on a baking sheet large enough to fit them all in a single layer. Season with olive oil, salt, and pepper, and mix well.
Lay asparagus out in an even single layer on the baking sheet and put in the oven for 10-20 minutes depending on the texture you prefer your asparagus to be. Longer cooking time will mean a softer texture.