Place the chicken breast in a shallow dish and cover with buttermilk, marinating in the refrigerator for at least 30 minutes.
In a small bowl, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, sea salt, black pepper, and smoked paprika.
Remove the chicken from the buttermilk, letting any excess drip off, then dredge thoroughly in the flour and spice mixture until evenly coated.
Heat the avocado oil in a non-stick skillet over medium heat.
Add the chicken to the skillet 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 the same pan, lower the heat and whisk in the unsweetened almond milk and nutritional yeast, scraping up any browned bits from the bottom.
Simmer the gravy for 2 minutes until thickened, then pour over the chicken and serve immediately.