Place the chicken breast in a bowl and pour the buttermilk over it, ensuring it is fully submerged to marinate for 15 minutes.
In a shallow dish, whisk together the almond flour, arrowroot starch, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture until evenly coated.
Heat the avocado oil in a large skillet over medium-high heat.
Place the chicken in the skillet and cook for 5 to 6 minutes per side until the crust is golden and the internal temperature reaches 165 degrees.
While the chicken cooks, steam the green beans in a small amount of water until tender-crisp and bright green.
Serve the crispy chicken immediately alongside the steamed green beans.