Preheat your oven to 400°F (200°C) and place a wire cooling rack over a large baking sheet to ensure maximum air circulation for the chicken.
Place the chicken breast in a shallow bowl and pour the buttermilk over it, letting it marinate for at least 15 minutes to tenderize the meat.
In a separate shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing excess to drip off, then dredge it thoroughly in the flour mixture, pressing the coating firmly onto the meat.
Place the coated chicken on the wire rack and lightly mist the top with avocado oil spray to help achieve a golden-brown finish.
Bake for 20 to 25 minutes, or until the internal temperature reaches 165°F and the crust is visibly crispy.
While the chicken bakes, steam the green beans for 5 to 7 minutes until they are tender-crisp and bright green.
Serve the crispy chicken immediately alongside the steamed green beans for a balanced, clean-eating dinner.