Preheat the air fryer: Set it to 390–400°F (200–205°C) for 3–5 minutes. A hot basket gives better browning.
Prep the chicken: Pat the chicken dry with paper towels.
Toss with 1 tablespoon oil, 1/2–1 teaspoon salt, pepper, garlic powder, onion powder, and paprika. Add red pepper flakes if you like heat.
Prep the broccoli: Dry the florets well. Toss with 1–2 tablespoons oil and a pinch of salt and pepper.
Keep the pieces similar in size so they cook evenly.
Mix the sauce: Stir soy sauce, honey, vinegar, sesame oil, and cornstarch until smooth. Set aside.
Cook the chicken first: Add chicken in a single layer to the air fryer basket. Air fry 7–10 minutes, shaking halfway, until browned and the thickest piece reaches 165°F (74°C).
Cook the broccoli: Remove chicken to a bowl.
Add broccoli to the basket. Air fry 6–8 minutes, shaking once, until crisp-tender with a few charred edges.
Combine with sauce: Return chicken to the basket or a skillet and add the sauce. Toss 30–60 seconds in the hot basket (or 1–2 minutes over medium heat in a skillet) until the sauce lightly thickens and coats everything.
Taste and adjust: Add a pinch more salt, black pepper, or a squeeze of lemon/lime if needed.
For extra heat, sprinkle more red pepper flakes.
Portion for meal prep: Divide into 4–5 containers with rice, quinoa, or cauliflower rice. Top with sesame seeds and green onions if using.