Slice the chicken breast into even cutlets and place them in a bowl with the buttermilk to marinate for 15 minutes.
In a shallow dish, combine the 2 tablespoons of arrowroot powder with garlic powder, onion powder, sea salt, black pepper, and smoked paprika.
Remove each chicken piece from the buttermilk, letting the excess drip off, then dredge thoroughly in the seasoned arrowroot mixture.
Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Place the chicken in the skillet and cook for 4 to 5 minutes per side until the coating is golden and the internal temperature reaches 165 degrees.
Transfer the chicken to a plate and reduce the skillet heat to medium.
Whisk the almond milk, the remaining 1 teaspoon of arrowroot powder, and dried thyme into the pan drippings, stirring constantly until the gravy is thick and bubbly.
Serve the crispy chicken immediately topped with the warm, creamy gravy.