Slice the chicken breast into even 1-inch thick strips to ensure uniform cooking.
Place the chicken strips in a bowl and pour the buttermilk over them, tossing to coat, and let marinate for 15 minutes.
In a shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, paprika, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, shaking off the excess, and dredge thoroughly in the flour mixture until fully coated.
Heat the avocado oil in a large non-stick skillet over medium-high heat until shimmering.
Place the chicken in the skillet and cook for 4-5 minutes per side until the crust is golden brown and the chicken is cooked through.
While the chicken is searing, steam the green beans in a steamer basket over boiling water for 5-6 minutes until tender-crisp.
Serve the crispy chicken strips immediately alongside the fresh steamed green beans.