Preheat oven 350 degrees and prepare a baking sheet with non stick cooking spray and set aside.
Prepare your bowls to coat your chicken tenders. In your first bowl add flour, salt, and ranch seasoning. In your second bowl whisk together egg and buttemilk. In the third bowl add panko bread crumbs.
Start by placing your tenders in the first bowl with flour and coat. Next into the eggs. Shake off any excess and then coat in bread crumbs. Place your coated chicken tender on your prepared baking sheet. Repeat until all chicken is coated.
Brush chicken tenders with oil and bake for 15-20 minutes or until chicken is fully cooked, turning half way through cooking time to brush with oil again.