Place the chicken breast in a shallow bowl and pour the buttermilk over it, letting it marinate for at least 15 minutes.
In a separate plate, whisk together the almond flour, 1 tablespoon of arrowroot powder, garlic powder, onion powder, sea salt, black pepper, and smoked paprika.
Remove the chicken from the buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture until evenly coated.
Heat the avocado oil in a medium skillet over medium heat until shimmering.
Carefully place the chicken in the skillet and cook for 5-6 minutes per side, or 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 plate.
In the same pan, whisk the almond milk and the remaining 1 teaspoon of arrowroot powder into the pan drippings, simmering for 2 minutes until the gravy thickens.
Stir in the fresh thyme and pour the warm gravy over the chicken before serving.