Wash your hands well with soap and warm water for at least 20 seconds
Line a baking sheet pan with aluminum foil and lightly spray with vegetable oil cooking spray.
In a bowl, whisk together garlic powder, onion powder, paprika, salt, and pepper.
Place buttermilk into a small mixing bowl. With tong, dip drumsticks into buttermilk and place in a resealable plastic storage bag. Repeat for all drumsticks. Pour dry seasonings into bag. Seal bag and toss to coat drumsticks. Use tongs to transfer to baking sheet pan.
Bake for 40-45 minutes until chicken is golden brown and internal temperature is 165°F. Top with parsley if using.