Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully coated.
In a separate wide dish, whisk together the almond flour, arrowroot starch, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting the excess drip off, then dredge it thoroughly in the flour mixture until evenly coated.
Heat the avocado oil in a large skillet over medium heat until shimmering.
Carefully place the chicken in the skillet and cook for 5-7 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.
In the same pan, whisk the chicken bone broth into the remaining drippings, scraping up any browned bits from the bottom.
Simmer the sauce for 3-4 minutes until thickened into a velvety gravy, then stir in the fresh thyme.
Serve the crispy chicken immediately with the warm gravy poured over the top.