Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
In a small mixing bowl, combine the all-purpose flour, baking powder, and a pinch of sea salt.
Stir in the Greek yogurt until a shaggy dough forms, then gently knead it a few times on a floured surface.
Shape the dough into one thick round biscuit and place it on the prepared baking sheet.
Bake the biscuit for 12 to 15 minutes until the top is lightly golden and firm to the touch.
While the biscuit bakes, place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
Place the chicken in a shallow bowl with the buttermilk and let it marinate for 10 minutes.
In a separate shallow dish, whisk together the almond flour, arrowroot starch, garlic powder, onion powder, sea salt, and black pepper.
Lift the chicken from the buttermilk, allowing the excess to drip off, then dredge it thoroughly in the flour mixture until well-coated.
Heat the avocado oil in a non-stick skillet over medium-high heat.
Carefully place the chicken in the hot pan and cook for 4 to 5 minutes per side until the exterior is crispy and the internal temperature reaches 165°F.
Remove the chicken from the pan and serve immediately alongside the fresh, warm biscuit.