Preheat your oven to 425°F and place a wire cooling rack over a large rimmed baking sheet.
Place the chicken breast in a shallow bowl and pour the buttermilk over it, letting it marinate for at least 20 minutes.
In a separate shallow dish, whisk together the almond flour, 1 tablespoon of arrowroot powder, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting any excess drip off, then dredge it in the flour mixture, pressing firmly to ensure an even coating.
Place the coated chicken on the prepared wire rack and lightly mist the top with avocado oil to help it crisp up.
Bake for 20-25 minutes until the crust is golden brown and the internal temperature of the chicken reaches 165°F.
While the chicken bakes, prepare the gravy by whisking the cashew milk, chicken bone broth, and the remaining teaspoon of arrowroot powder in a small saucepan over medium heat.
Bring the sauce to a gentle simmer, whisking constantly until it thickens into a velvety consistency, then stir in the fresh thyme.
Serve the crispy chicken immediately, generously drizzled with the warm herb gravy.