Slice the chicken breast into even strips and submerge them in a bowl with the buttermilk for at least 20 minutes.
In a shallow dish, whisk together the almond flour, half of the arrowroot powder, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, allowing the excess to drip off, and dredge thoroughly in the seasoned flour mixture.
Place the chicken in the air fryer basket, spray evenly with avocado oil, and cook at 400°F for 12-15 minutes until crispy and golden.
While the chicken is cooking, combine the chicken broth and whole milk in a small saucepan over medium heat.
Whisk the remaining arrowroot powder with a splash of water to create a slurry, then stir it into the saucepan and simmer until the gravy is thick and smooth.
Plate the crispy chicken strips and pour the warm gravy over the top before serving.