Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully submerged; marinate for at least 30 minutes in the refrigerator.
In a separate shallow dish, whisk together the almond flour, arrowroot starch, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting the excess drip off, then dredge it through the flour mixture until evenly coated on all sides.
Heat the avocado oil in a medium skillet over medium-high heat until shimmering.
Place the chicken in the skillet and cook for 5-6 minutes per side, or until the crust is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Remove the chicken from the pan and set aside to rest.
Reduce the heat to low and pour the chicken bone broth into the same skillet, scraping up any browned bits from the bottom.
Whisk in the Greek yogurt until the sauce is smooth and slightly thickened to create a creamy gravy.
Slice the chicken and serve immediately with the warm gravy drizzled over the top.