Creating Oven Fried Chicken is straightforward if you follow these steps:

1. Preheat Oven: Start by preheating your oven to 425°F (220°C).
2. Marinate Chicken: Place the chicken thighs and drumsticks in a large bowl. Pour the buttermilk over the chicken, ensuring it’s well-coated. Cover and refrigerate for at least 30 minutes (or overnight for best results).
3. Prepare Breading Mixture: In a separate bowl, combine the flour, garlic powder, onion powder, smoked paprika, cayenne pepper, salt, and black pepper. Mix thoroughly to combine the spices into the flour.
4. Prepare Chicken for Baking: Remove the chicken from the refrigerator. Allow any excess buttermilk to drip off, then dredge each piece in the flour mixture. Ensure the chicken is fully coated, pressing gently to adhere the flour.
5. Set Up the Baking Tray: Drizzle cooking oil over a baking sheet or line it with parchment paper for easier cleanup. Arrange the coated chicken pieces on the tray, ensuring they are spaced apart and not touching each other.
6. Bake the Chicken: Place the tray in the preheated oven and bake for 25 minutes. After 25 minutes, carefully flip the chicken pieces over and continue baking for another 15-20 minutes or until the chicken reaches an internal temperature of 165°F (75°C) and is golden brown.
7. Optional Crispiness: For an extra crispy finish, spray the chicken lightly with cooking spray before the last 10 minutes of baking.
8. Cool and Serve: Once fully cooked, remove the chicken from the oven and let it rest for 5 minutes before serving.

Following these steps will result in delicious Oven Fried Chicken that will surely win over family and friends!