Preheat the air fryer. Set to 390°F (200°C). Lightly spray the basket to prevent sticking.
Prep the cauliflower. Rinse and pat dry.
Cut into evenly sized florets so they cook at the same rate.
Make the coating. In a large bowl, combine panko, cornstarch, garlic powder, onion powder, smoked paprika, salt, and pepper. Drizzle cauliflower with olive oil and toss to coat. Sprinkle the dry mixture over the florets and toss again until the pieces are evenly covered.
Air fry in batches. Arrange florets in a single layer with space between them.
Cook for 12–15 minutes, shaking the basket halfway, until golden and crisp at the edges. Thicker pieces may need an extra 2–3 minutes.
Mix the sauce. While the cauliflower cooks, whisk sweet chili sauce, soy sauce, rice vinegar, sriracha, ginger, and sesame oil in a small bowl. Taste and adjust—add more vinegar for brightness or more sriracha for heat.
Toss and finish. Transfer hot cauliflower to a bowl and pour over the sauce.
Toss gently to coat. If you like stickier bites, return them to the air fryer for 1–2 minutes to set the glaze.
Garnish and serve. Sprinkle with sesame seeds and green onions. Add lime wedges and cilantro if you like.
Serve immediately while crisp.