Prep the chicken: Pat the thighs dry with paper towels. Trimming excess fat helps with crisping. If using skin-on, keep the skin intact.
Make the sauce: In a bowl, whisk Dijon, honey, whole grain mustard (if using), olive oil, garlic, apple cider vinegar, smoked paprika, thyme, salt, and pepper until smooth.
Marinate briefly: Toss the chicken in the sauce to coat well.
Let it sit 10–20 minutes while you heat the air fryer. Longer adds flavor, but even a quick soak works.
Preheat the air fryer: Set to 380°F (193°C) for 5 minutes. A hot basket helps prevent sticking and promotes browning.
Arrange the thighs: Lightly spray the basket.
Place thighs in a single layer, skin-side down if skin-on. Reserve a couple tablespoons of sauce for basting.
Air fry first side: Cook at 380°F for 10 minutes.
Flip and baste: Turn thighs over (skin-side up if using skin). Brush with the reserved sauce.
Finish cooking: Air fry another 8–12 minutes, depending on size and whether they’re bone-in.
You want an internal temperature of 175–190°F for bone-in thighs (juicier and more tender) and at least 165°F for boneless.
Crisp and glaze: If you want extra caramelization, raise heat to 400°F for the last 2–3 minutes. Watch closely to avoid burning the honey.
Rest and serve: Let the chicken rest for 5 minutes. Garnish with parsley and spoon any basket juices over the top.
Pair with rice, mashed potatoes, or a crunchy slaw.