Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, submerge the chicken in the buttermilk and let marinate for at least 15 minutes.
In a separate shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, sea salt, black pepper, and smoked paprika.
Remove the chicken from the buttermilk, allowing excess to drip off, then dredge thoroughly in the flour mixture, pressing to adhere.
Heat the avocado oil in a medium skillet over medium heat. Once shimmering, add the chicken and cook for 5-6 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
Remove the chicken from the pan and set aside to rest on a wire rack.
In the same skillet over low heat, whisk in the almond milk, nutritional yeast, and dried thyme, scraping up any browned bits from the bottom of the pan.
Simmer the gravy for 2-3 minutes until thickened, then pour over the chicken and serve immediately.