Preheat the air fryer to 400 degrees F for about 4 minutes. This ensures that the asparagus will cook evenly and get that nice crispy texture.
While the air fryer is heating up, rinse the asparagus spears under lukewarm water, then pat them dry with a paper towel. This step is crucial as excess water can create steam, preventing the asparagus from getting crispy.
Trim the woody ends off of the raw asparagus, which is roughly 1.5 to 2 inches off the bottom. Use a sharp knife and a cutting board, discarding the barky ends. This step helps to remove any tough, inedible parts.
Transfer the trimmed asparagus spears to a large plate or bowl. Drizzle them with avocado oil and sprinkle with sea salt and garlic powder. Get your hands in there and toss everything together until the asparagus stalks are evenly coated.
Now, arrange the asparagus in a single layer in the basket of the air fryer. Avoid overcrowding, as this will prevent them from getting that crispy finish.
Air fry at 400 degrees F for 6 to 8 minutes, shaking the basket halfway through for even cooking. Keep an eye on them; the goal is to have the asparagus turn a beautiful golden brown. If you're using very thin spears, they might only need about 4 to 6 minutes, while thicker spears may take up to 10 minutes.
Once cooked to your liking, carefully remove the asparagus from the air fryer. It will be hot, so using tongs or a spatula is best.
Serve immediately, garnished with fresh lemon zest and a sprinkle of crushed red pepper flakes if desired. For a special treat, you can also grate some fresh parmesan cheese over the top.
If you want to take it a step further, consider whipping up a batch of hollandaise sauce or melted butter for dipping. It adds a delicious touch!