In a medium bowl, whisk together the buttermilk, garlic powder, chili powder, paprika, onion powder, salt, and pepper.
Place the chicken breasts in a large zip-top bag or shallow dish, and pour the buttermilk mixture over them. Seal or cover the bag or dish and let the chicken marinate in the refrigerator for at least 2 hours, or overnight.
Preheat the oven to 375 degrees Fahrenheit.
Remove the chicken from the marinade and place on a baking sheet. Discard the remaining marinade.
Drizzle the chicken with the olive oil and bake for 20 to 25 minutes, or until the chicken is cooked through and the internal temperature reaches 165 degrees Fahrenheit.
Serve with your favorite sides and enjoy!
Interesting Facts
Buttermilk is a low-fat dairy product that adds a great flavor to baking and marinating.
The combination of spices in this recipe gives the chicken a nice, spicy kick.
Marinating the chicken overnight gives it the most flavor.