Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
Submerge the chicken in buttermilk in a shallow bowl and let it marinate for at least 15 minutes.
In a separate bowl, whisk together the arrowroot starch, sea salt, black pepper, garlic powder, onion powder, and paprika.
Remove the chicken from the buttermilk, allowing excess to drip off, then dredge thoroughly in the starch mixture until well-coated.
Heat the avocado oil in a cast-iron skillet over medium-high heat until shimmering.
Carefully place the chicken in the skillet and cook for 4-5 minutes per side until the exterior is a deep golden brown and the internal temperature reaches 165°F.
Remove the chicken to a plate and reduce the heat to medium.
Whisk the whole wheat flour into the remaining oil in the pan for 1 minute to create a roux.
Slowly pour in the chicken bone broth while whisking constantly until the gravy thickens into a velvety consistency.
Serve the crispy chicken immediately with the warm gravy poured over the top.