Preheat your oven to 425°F (220°C).
In a shallow bowl, combine the 1/4 cup of buttermilk with salt, pepper, garlic powder, and paprika to create a flavorful marinade.
Place the chicken breast in the marinade, ensuring it is well coated. Allow it to marinate for at least 30 minutes (or up to 2 hours in the refrigerator).
After marinating, remove the chicken and gently shake off excess buttermilk. Dredge the chicken evenly in almond flour, ensuring a light coating on all sides.
Arrange the coated chicken on a baking sheet lined with parchment paper.
Prepare the green beans by tossing them with 1 teaspoon olive oil, a pinch of salt, and pepper. Spread them out on a separate baking sheet.
Place both the chicken and green beans in the preheated oven. Bake the chicken for 20-25 minutes, or until the internal temperature reaches 165°F (74°C), and roast the green beans for about 15 minutes until they are tender and slightly crispy.
Remove both from the oven and allow the chicken to rest for 5 minutes before serving alongside the roasted green beans.