Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully coated. Let it marinate for at least 15 minutes.
In a separate small bowl, whisk together the arrowroot starch, smoked paprika, garlic powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting any excess drip off, and dredge it thoroughly in the seasoned arrowroot mixture until evenly coated.
Heat the avocado oil in a non-stick skillet over medium heat. Once the oil is 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 it aside to rest on a plate.
Using the same skillet, reduce the heat to low and whisk in the chicken bone broth and cashew milk, scraping up any browned bits from the bottom of the pan.
Simmer the sauce for 2-3 minutes until it thickens into a creamy gravy, then stir in the fresh parsley.
Plate the chicken and drizzle the warm gravy over the top before serving.