Preheat your air fryer to 400°F and lightly grease the basket with the olive oil.
Slice the sweet potato into thin wedges and trim the ends of the green beans.
Place the chicken breast in a shallow bowl with the buttermilk and let it marinate for at least 15 minutes to tenderize.
In a separate dish, whisk together the panko breadcrumbs, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing excess to drip off, then press it firmly into the panko mixture until thoroughly coated.
Place the coated chicken and sweet potato wedges into the air fryer basket in a single layer.
Air fry for 12-15 minutes, flipping the chicken and tossing the potatoes halfway through, until the chicken is golden and reaches an internal temperature of 165°F.
While the chicken cooks, steam the green beans for 4-5 minutes until they are bright green and tender-crisp, then serve alongside the chicken and potatoes.