Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Place the chicken breast in a shallow bowl and pour the buttermilk over it, letting it marinate for at least 15 minutes.
In a separate small bowl, whisk together the almond flour, arrowroot powder, smoked paprika, garlic powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting any excess drip off, then dredge it thoroughly in the almond flour mixture until fully coated.
Place the coated chicken and the broccoli florets on the prepared baking sheet. Lightly mist the chicken and broccoli with the avocado oil.
Bake for 20-25 minutes, flipping the chicken halfway through, until the coating is golden and the chicken reaches an internal temperature of 165°F.
While the chicken bakes, steam or boil the sweet potato until tender, then mash it until smooth.
Serve the crispy chicken alongside the roasted broccoli and the creamy mashed sweet potato.