Toss the pork with soy sauce, sesame oil, garlic powder, salt and pepper. Let it sit 10 minutes.
Stir in the beaten egg. In a separate bowl, whisk the cornstarch and flour.
Let excess egg drip off each piece, then coat it in the cornstarch mixture and shake off the extra.
Preheat the air fryer to 400°F for 3 minutes. Spray the basket, add the pork in a single layer and spray the tops.
Air fry 12 to 14 minutes, flipping and spraying halfway, until deep golden and 145°F inside. Rest 3 minutes. Work in batches if needed.
While the pork cooks, whisk the sauce ingredients in a microwave-safe bowl. Microwave in 30-second bursts, stirring between, until thick and glossy, about 90 seconds.
Toss the hot pork with pineapple, peppers and onion. Pour the sauce over, toss and serve right away over rice.