Preheat your air fryer to 375°F (190°C).
Place the chicken breast between two sheets of parchment paper and pound to an even 1/2-inch thickness.
Place the buttermilk in a shallow bowl and submerge the chicken, letting it soak for 10 minutes.
In a separate shallow dish, whisk together the panko breadcrumbs, smoked paprika, garlic powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing excess to drip off, and dredge in the panko mixture, pressing firmly to ensure a thick coating.
Lightly mist the air fryer basket and the chicken with avocado oil spray.
Air fry for 12-15 minutes, flipping halfway through, until the internal temperature reaches 165°F and the crust is golden brown.
In a medium bowl, toss the mixed baby greens with the apple cider vinaigrette.
Serve the hot crispy chicken immediately alongside the fresh salad.