Prep the oven or air fryer: Heat oven to 425°F (220°C). Line a sheet pan with parchment and place a wire rack on top if you have one. For an air fryer, set to 400°F (205°C) and preheat for 3 minutes.
Flatten the chicken: If needed, slice thick breasts into cutlets.
Lightly pound to an even 1/2-inch thickness. Pat dry with paper towels for better browning.
Make the marinade: In a bowl, mix Greek yogurt, Dijon, lemon juice, 1 tbsp olive oil, and a pinch of salt and pepper. Toss the chicken to coat.
Let sit 10–15 minutes while you prepare the coating.
Mix the crust: In a shallow dish, combine breadcrumbs, Parmesan, garlic powder, onion powder, paprika, 1/2 tsp salt, pepper, and herbs if using. Drizzle in 1 tbsp olive oil and toss to evenly moisten the crumbs.
Coat the chicken: Lift each piece from the marinade, let excess drip, then press into the breadcrumb-Parmesan mix. Press firmly on both sides so the crust adheres well.
Arrange for baking: Lightly oil the rack or pan and set chicken on it.
Spray the tops with cooking spray for extra crispness.
Bake or air fry: Oven: Bake 12–16 minutes, flipping halfway. Cook until the center reaches 165°F (74°C) and the crust is golden.
Air fryer: Cook 9–12 minutes, flipping at 6 minutes, until crisp and cooked through.
Rest and serve: Let chicken rest 3 minutes to keep juices in. Finish with a squeeze of lemon and a sprinkle of parsley.
Serve with a big salad, roasted veggies, or cauliflower mash.