Trim asparagus spears (see note) and rinse well. If the spears are very sandy, soak them in cold water for 5 minutes. Usually a rinse is sufficient. Pat spears dry with a clean towel or paper towels.
Toss asparagus spears with oil and seasonings (and cheese, if using).
Place in an even layer in the air fryer.
Air fry at 380ºF for 6-7 minutes or until tender (see note).
Video
Notes
To quickly trim asparagus, lightly bend each spear near the bottom. The woody end should easily snap off. The asparagus seems to "know" where it needs to be trimmed.
Thicker stalks of asparagus may need to cook slightly longer.
Embellish asparagus with a drizzle of balsamic reduction. Try a squeeze of lemon juice with a sprinkle of lemon zest. Add fresh chopped herbs such as basil, parsley, chives, dill, lemon balm or summer savory.