Pat the chicken completely dry. Take the chicken thighs out of the packaging and use paper towels to pat every surface dry — top, bottom, and the folded edges. This is the step most people skip and the reason most panko crusts fall off. Surface moisture prevents the mayo binder from gripping the chicken properly, and any remaining moisture will steam in the air fryer instead of crisp. Dry chicken equals better adhesion, which equals crispier breaded chicken thighs in the air fryer. Sixty seconds of effort, enormous difference in result.

Season the chicken directly. Season both sides of each thigh with salt and black pepper before coating. This baseline seasoning goes directly into the meat — not just the crust — so every bite is seasoned all the way through.

Make the mayo-Dijon binder. In a wide, shallow bowl, whisk together the mayonnaise and Dijon mustard until smooth and fully combined. A wide, shallow bowl — not a deep one — makes it easy to coat large chicken thighs without making a mess.

Make the seasoned panko crust. In a separate wide, shallow bowl, combine the panko breadcrumbs, flour, smoked paprika, garlic powder, onion powder, salt, and pepper. Stir thoroughly to distribute the spices evenly throughout. Every bite of the panko chicken thigh crust should be seasoned — uneven mixing means bland patches.

Coat the chicken — press, don't just dip. Working one thigh at a time, add it to the mayo-Dijon bowl and coat every surface thoroughly. Then transfer it to the panko mixture and press firmly — flip and press again on both sides and the edges. The key is pressing, not dipping. Lightly dropping the chicken in and lifting it produces a thin, loose coating that falls off during cooking. Pressing compacts the panko crust so it grips the binder and stays put through the flip.

Preheat your air fryer. Preheat to 400°F (200°C) for 5 minutes. For panko breaded chicken thighs in the air fryer, preheating is non-negotiable. You need the basket surface and the air at full temperature the moment the chicken goes in. A cold air fryer means the first few minutes are just warming up — during which the mayo can start to melt and the panko can slide before it has a chance to set.

Arrange and spray. Lightly spray the air fryer basket with cooking spray. Arrange the coated chicken thighs in a single layer with clear space between each piece — do not overlap, do not crowd. Crowding the basket is one of the top three reasons panko coatings fail. The hot air needs to circulate freely around every piece. Spray the tops of each thigh with cooking spray. That light mist on the panko surface is what ignites the browning process.

Air fry 8–10 minutes, flip, 8–10 more minutes. Air fry at 400°F for 8–10 minutes. Using tongs, carefully flip each thigh. Spray the newly exposed tops with cooking spray again. Air fry for another 8–10 minutes. Total cook time for crispy air fryer panko boneless chicken thighs is 18–20 minutes for average-sized thighs.

Check the temperature. Insert an instant-read thermometer into the thickest part of the largest thigh. Done at 165°F (74°C). If the crust is deep golden but the thermometer hasn't hit 165°F, reduce to 375°F and give it 2–3 more minutes to finish through without over-browning the coating. The crust should be deep golden-brown and audibly crunchy when you tap it.

Rest on a wire rack. Transfer to a wire rack — not a paper towel-lined plate — and rest for 3–5 minutes before serving. A wire rack lets air circulate underneath so the bottom crust stays crispy. A plate traps steam underneath and softens the bottom crust you just worked to build.