Place the chicken breast in a bowl and cover with buttermilk; marinate in the refrigerator for at least 30 minutes.
In a shallow dish, whisk together the whole wheat flour, garlic powder, onion powder, paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing the excess to drip off, and dredge it thoroughly in the seasoned flour mixture.
Heat the avocado oil in a skillet over medium heat and cook the chicken for 5 to 6 minutes per side until the exterior is golden and the center is cooked through.
Remove the chicken from the skillet and set aside to rest.
In a small bowl, whisk the almond milk and arrowroot powder together until smooth.
Pour the milk mixture into the hot skillet, scraping up any browned bits from the bottom, and simmer until the gravy reaches a velvety consistency.
Serve the chicken topped with the warm gravy and a garnish of fresh parsley.