Place the chicken breast in a bowl with buttermilk and marinate for at least 30 minutes in the refrigerator.
In a shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, smoked paprika, salt, and pepper.
Remove the chicken from the buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture until evenly coated.
Heat avocado oil in a large skillet over medium-high heat until shimmering.
Carefully place the chicken in the skillet and cook for 5 to 7 minutes per side until the coating is golden-brown and the chicken is cooked through.
Remove the chicken from the pan and set aside on a plate; lower the skillet heat to medium.
Pour the chicken bone broth into the skillet, scraping up any browned bits from the bottom, then whisk in the Greek yogurt until a smooth, velvety gravy forms.
Drizzle the warm gravy over the chicken and garnish with chopped fresh parsley before serving.