Slice the chicken breast into even strips and place them in a bowl with the buttermilk to marinate for at least 20 minutes.
In a shallow dish, whisk together 2 tablespoons of arrowroot powder, sea salt, black pepper, garlic powder, onion powder, and paprika.
Remove chicken from buttermilk, letting excess drip off, then dredge each piece in the seasoned arrowroot mixture until fully coated.
Heat avocado oil in a large skillet over medium-high heat until shimmering.
Carefully place chicken in the pan and sear for 4-5 minutes per side until the coating is golden brown and the internal temperature reaches 165°F.
Remove chicken from the pan and set aside on a plate.
In the same skillet, whisk in the chicken bone broth and almond milk, scraping up any browned bits from the bottom.
Whisk the remaining teaspoon of arrowroot powder with a splash of water to create a slurry, then stir it into the pan.
Simmer the gravy for 2-3 minutes until thickened, then pour over the crispy chicken and serve immediately.