1️⃣ Preheat air fryer to 375°F.
2️⃣ In a shallow dish, combine Parmesan cheese, flour, onion powder, garlic powder, salt, pepper, and rosemary.
3️⃣ Pat chicken thighs dry. (Optional: Dip in 2 beaten eggs before coating.)
4️⃣ Coat chicken thighs in Parmesan mixture.
5️⃣ Place in air fryer basket. Air fry at 375°F for 18–22 minutes, flipping halfway, until internal temp reaches 175°F–185°F.
6️⃣ While chicken cooks, make the sauce: In saucepan over medium heat, melt butter. Add garlic; cook 1–2 min.
7️⃣ Whisk in heavy cream, Parmesan, basil, salt, and pepper. Simmer 5–7 min until thickened.
8️⃣ Serve chicken topped with creamy garlic sauce. Enjoy!