Place the chicken breast in a shallow dish and pour the buttermilk over it, ensuring it is fully coated. Marinate for at least 20 minutes.
In a small bowl, whisk together the whole wheat flour, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting the excess drip off, then dredge it thoroughly in the seasoned flour mixture.
Heat the avocado oil in a medium skillet over medium heat. Once hot, add the chicken and cook for 5-7 minutes per side until the crust is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Remove the chicken from the pan and set aside to rest. In a small jar, whisk the almond milk and cornstarch together until smooth.
Pour the almond milk mixture into the hot skillet, scraping up any browned bits from the bottom. Simmer for 2 minutes until the gravy has thickened into a velvety consistency.
Pour the gravy over the chicken, garnish with fresh parsley, and serve immediately.