Steam the broccoli for 4–5 minutes, until just tender but still holding its shape. Drain well and allow to cool slightly.
Preheat the air fryer to 200°C.
Sprinkle the grated Parmigiano Reggiano in small generous mounds over the air fryer tray or baking paper.
Place a broccoli floret over each mound and gently smash down with the base of a glass or spatula, pressing the broccoli firmly into the cheese.
Drizzle with olive oil and season with garlic powder, onion powder, salt and black pepper.
Air fry for 8–10 minutes, or until the broccoli is golden and the Parmigiano Reggiano has formed a crisp crust underneath.
Allow to cool for a minute or two to crisp up, then finish with a squeeze of fresh lemon. Serve hot.