Pat the steak dry with paper towels and slice it against the grain into evenly sized strips. This helps the beef cook evenly and stay tender.
- Season the beef.In a bowl, combine the cornstarch, garlic powder, smoked paprika, salt, and black pepper. Toss the steak strips in the beaten egg, then coat them thoroughly in the seasoned cornstarch mixture. Shake off any excess coating.
- Preheat the air fryer.Set your air fryer to 400°F (200°C) and preheat it for about 3 minutes, if your model requires preheating.
- Arrange the steak strips.Lightly spray the air fryer basket with oil. Place the coated steak strips in a single layer, leaving space between each piece. Work in batches if necessary, then lightly spray the tops with oil.
- Air-fry until crispy.Cook for 8–12 minutes, turning the strips halfway through. Cooking time depends on their thickness and your air fryer, so check early to avoid overcooking. For food safety, whole-cut beef should reach at least 145°F (63°C), followed by a 3-minute rest.
- Prepare the honey glaze.While the steak cooks, melt the butter in a small saucepan over medium-low heat. Add the minced garlic and cook for about 30 seconds until fragrant. Stir in the honey, soy sauce, rice vinegar, and red pepper flakes, if using.
- Thicken the sauce.Let the glaze simmer gently for 1–2 minutes. If you prefer a thicker coating, stir in the cornstarch slurry and cook briefly until glossy. Remove the pan from the heat.
- Toss and serve.Transfer the crispy steak strips to a bowl and drizzle with the honey glaze. Toss gently to coat, keeping in mind that adding sauce will soften the crispy coating slightly. Garnish with green onions and sesame seeds, then serve immediately.