Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the sweet potato into thin wedges and trim the ends off the green beans.
Place the chicken breast in a shallow bowl with the buttermilk and let it marinate for 15 minutes.
In a separate bowl, whisk together the almond flour, arrowroot powder, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting excess drip off, then dredge it through the flour mixture, pressing firmly to create a thick coating.
Arrange the breaded chicken, sweet potato wedges, and green beans on the prepared baking sheet.
Drizzle or mist the chicken and vegetables evenly with avocado oil.
Bake for 20 to 25 minutes, flipping the vegetables halfway through, until the chicken is golden brown and reaches an internal temperature of 165°F.