Prep the chicken: Pat the chicken tenders dry with paper towels.
If using chicken breasts, slice into even strips about 1 inch wide.
Make the ranch marinade: In a bowl, combine sour cream (or yogurt), mayonnaise, lemon juice, ranch seasoning, garlic powder, onion powder, salt, and pepper. Stir until smooth.
Marinate: Add chicken to the bowl, toss to coat, then cover and refrigerate for at least 30 minutes. For maximum flavor, marinate 2–4 hours.
Set up breading station: In one shallow bowl, whisk eggs with water. In another, mix almond flour, Parmesan, parsley, dill, garlic powder, onion powder, paprika, salt, and pepper.
Preheat: Oven to 425°F (220°C), or preheat air fryer to 390°F (200°C).
Line a sheet pan with parchment and set a wire rack on top if baking. This helps air circulate and keeps the coating crisp.
Bread the chicken: Working one piece at a time, let excess marinade drip off, dip into egg wash, then press into the ranch coating. Pack the coating on firmly and place on the rack or air fryer basket. Repeat with remaining pieces.
Lightly oil: Mist the tops with avocado oil spray, or drizzle sparingly.
This encourages browning and crunch.
Bake or air fry: Oven: 16–20 minutes, flipping halfway. Cook until golden and the internal temperature reaches 165°F (74°C).
Air fryer: 10–12 minutes total, flipping at the halfway mark. Work in batches to avoid crowding.
Rest and serve: Let tenders rest 3 minutes.
Squeeze with lemon, sprinkle a little extra dill or parsley, and serve with sugar-free ranch.