Preheat oven to 400 degrees. Line a large baking sheet with parchment paper and set aside.
Add the ranch dressing to one medium bowl. Mix together the cornflakes and sharp cheddar in a separate medium bowl.
Dip the chicken tenders into the ranch dressing, then dredge the chicken in the cornflakes and cheddar mixture, pressing to coat as needed. Repeat with remaining tenders, until all are coated.
Place chicken tenders on prepared baking sheet and bake in preheated oven for 20-25 minutes, until chicken is crisp and has reached an internal temperature of 165 degrees.
Allow chicken to cool on the pan for 5 minutes after cooking. Serve with extra ranch dressing as desired.