Prep the steak, onion, red pepper, and snap peas. The steak should be sliced against the muscle length.
In a medium bowl or Ziploc bag (I recommend using a Ziploc bag), mix the marinade ingredients together (garlic, chili flakes, soy sauce, cornstarch, rice vinegar, sesame oil, brown sugar, water, and Chinese 5 spice).
Add the beef and veggies to the bowl or Ziploc bag and marinate for at least 1 hour. (Freezer meal option: Place in the freezer. When you are ready to make the meal, thaw the bag in the refrigerator 24 hours in advance).
Preheat the air fryer at 400°F/204°C for 5 minutes.
Spray the air fryer basket with avocado oil.
Using tongs, add all the beef and veggies to the air fryer basket. Discard the marinade.
Cook in the air fryer at 400°F/204°C for 8 minutes. No need to stir.
Serve with sliced scallions, sesame seeds, and rice.
Serve with 2-3 cups cooked rice, 3 sliced scallions & 2 tablespoons of sesame seed.