Start by placing the chicken tenderloins in a large bowl and cover them with buttermilk. Make sure each piece is fully coated and separated. This soaking step keeps the chicken moist and helps the seasoning stick better.
Mix the flour, ranch seasoning, black pepper, and parsley in a shallow bowl. Dredge each tender in the mixture, pressing the coating gently into the chicken. Place coated tenders on a wire rack for a few minutes; letting them rest makes the coating extra crispy when fried.
Heat oil in your skillet or fryer to 375°F. Fry the tenders in batches for 5-8 minutes per side until golden brown and cooked through. Transfer to a plate lined with paper towels to drain excess oil, then serve immediately.