Add in all 12 chicken tenders, zip up the bag (squeezing out all excess air), and shake or massage the bag until all tenders are coated with ranch dressing. Allow to marinate for 15 minutes to 30 minutes. Preheat oven to 475 degrees and line a large baking dish with foil (9x13 or 9x11 dish). Drizzle 2 Tbsp of oil over the bottom of the pan. In a large zippered bag, add Bisquick, paprika, salt, and black pepper. Add marinated chicken tenders into the bag, zip up, and shake until all tenders are coated.