Wash and dry the cauliflower thoroughly under cool running water. Remove any green leaves and the tough core.
Cut the cauliflower into bite-sized florets.
Combine flour, garlic powder, onion powder, smoked paprika, cayenne pepper, salt, and black pepper in a bowl.
Crack and whisk the eggs in a separate bowl.
Mix panko breadcrumbs with grated Parmesan cheese in another bowl.
Roll each floret in the flour mixture, dip in the egg wash, and coat with the breadcrumb mixture.
Preheat the air fryer to 375°F (190°C) for 3–5 minutes.
Lightly spray the air fryer basket with cooking spray.
Arrange the coated cauliflower florets in a single layer in the air fryer.
Spray the tops of the florets lightly with cooking spray.
Air fry for 15–20 minutes, shaking the basket halfway through.
Check for doneness — the coating should be golden brown and crispy.
For the dipping sauce, combine Greek yogurt (or sour cream), mayonnaise, lemon juice, minced garlic, and chopped dill in a small bowl. Stir until smooth and creamy. Season with salt and pepper to taste.