Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, pour the buttermilk. In a second bowl, whisk together the almond flour, half of the arrowroot powder, garlic powder, onion powder, sea salt, and black pepper.
Dip the chicken into the buttermilk, then dredge thoroughly in the flour mixture, pressing firmly to adhere.
Heat the avocado oil in a large skillet over medium heat. Once shimmering, add the chicken and cook for 5-6 minutes per side until golden-brown and the internal temperature reaches 165 degrees Fahrenheit.
Remove the chicken and let it rest on a wire rack. In the same skillet, whisk the chicken bone broth, nutritional yeast, and the remaining arrowroot powder into the pan drippings.
Simmer the gravy for 2 minutes while whisking constantly until thickened and velvety.
While the gravy simmers, steam the green beans until bright green and tender-crisp.
Serve the crispy chicken topped with the warm gravy alongside the steamed green beans.