Prep your dipping stations: Line up three bowls—one for the flour mixture, one for the buttermilk mixture, and one for breadcrumbs.
Mix the coatings: Combine the flour, salt, and ranch seasoning in the first bowl. In the second, let milk and vinegar sit for 5 minutes, then whisk with the egg and hot sauce. In the last bowl, stir the breadcrumbs with the rotisserie chicken seasoning.
Flatten tenderloins: Gently pound each tenderloin on a cutting board to even out the thickness. This step ensures all pieces cook at the same rate.
Coat the tenders: Dredge each tenderloin in the flour (shake off excess), then dip into the buttermilk, letting the extra liquid drip off. Finally, coat with breadcrumbs, pressing lightly so the coating adheres.
Arrange and spray: Place tenders in a single layer in your air fryer basket. Spray the tops generously with avocado oil.
Air fry: Cook at 400°F for 7-9 minutes, flipping halfway through. The exterior should be golden and crisp, and the internal temp should read 165°F.
Serve and enjoy: Pair with your favorite dipping sauces like honey mustard, ranch, or barbecue!