In a large mixing bowl, combine the chicken tenders and buttermilk, ensuring the chicken is well coated. Cover and refrigerate for at least 1 hour, or preferably overnight.
In a separate bowl, mix together the flour, crushed cornflakes, cheddar cheese, ranch dressing mix, garlic powder, onion powder, paprika, black pepper, and a pinch of salt.
After marinating, take the chicken tenders out of the buttermilk and dredge each tender in the coating mixture, pressing gently to ensure it sticks.
In a skillet, heat about an inch of oil over medium-high heat until it reaches 350°F (175°C).
Carefully add the coated chicken tenders to the hot oil in batches, frying for 4-5 minutes on each side until golden brown and cooked through.
Remove the tenders from the oil and place them on a paper towel-lined plate to drain excess oil.
Serve with extra ranch dressing on the side for dipping and a sprinkle of chopped fresh parsley.
Notes
For a rustic touch, serve on a wooden board with ranch dressing and sliced vegetables.