Slice the chicken breast into even strips or medallions to ensure quick and even cooking.
Place the chicken in a small bowl and pour the buttermilk over it, allowing it to marinate for at least 15 minutes.
In a shallow dish, whisk together the whole wheat flour, garlic powder, paprika, sea salt, and black pepper.
Remove each piece of chicken from the buttermilk, letting the excess drip off, then dredge thoroughly in the flour mixture.
Heat the avocado oil in a large non-stick skillet over medium-high heat until it begins to shimmer.
Carefully place the chicken in the skillet and fry for 4-5 minutes per side until the coating is golden-brown and the internal temperature reaches 165°F.
While the chicken is frying, steam the green beans in a steamer basket over boiling water for 5 minutes until tender-crisp.
Plate the crispy chicken immediately alongside the steamed green beans for a balanced, clean-eating feast.