Preheat your air fryer to 375°F (190°C).
Place the chicken breast in a small bowl and coat thoroughly with the buttermilk, letting it sit for 5 minutes.
In a separate shallow dish, whisk together the almond flour, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk and dredge it in the almond flour mixture, pressing firmly to ensure an even, crispy coating.
In a small mixing bowl, combine the oat flour, Greek yogurt, and baking powder, stirring until a thick dough forms.
Shape the dough into a tall, round biscuit and place it alongside the chicken in the air fryer basket.
Lightly brush or spray the chicken and biscuit with avocado oil to promote browning.
Air fry for 12-15 minutes, flipping the chicken halfway through, until the chicken is golden-brown and the biscuit is cooked through.