Slice the chicken breast into even cutlets and marinate in buttermilk for at least 20 minutes.
In a shallow dish, combine the almond flour, half of the arrowroot starch, garlic powder, onion powder, sea salt, black pepper, and paprika.
Dredge each chicken cutlet into the seasoned flour mixture, pressing firmly to ensure an even coating.
Lightly spray or brush the chicken with avocado oil and place in the air fryer basket at 400°F for 12 to 15 minutes, flipping halfway through until golden and crispy.
While the chicken cooks, bring the chicken bone broth and fresh thyme to a gentle simmer in a small saucepan.
Whisk the remaining arrowroot starch with a teaspoon of cold water to create a slurry, then stir it into the broth until thickened.
Remove the gravy from heat and whisk in the Greek yogurt until smooth and creamy.
Serve the crispy chicken immediately, drizzled with the warm herb gravy.