In a bowl, marinate the chicken tenders in buttermilk for at least 30 minutes (or up to overnight) in the refrigerator.
Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper or lightly grease it.
In a shallow dish, mix together the flour, ranch seasoning mix, garlic powder, onion powder, black pepper, and paprika until well combined.
In another bowl, combine the grated cheddar cheese and breadcrumbs (if using).
Remove the chicken from the buttermilk, allowing any excess to drip off.
Dredge each chicken tender in the flour mixture, ensuring they're evenly coated. Shake off any excess flour.
Next, press each tender into the cheese mixture, coating it thoroughly.
Place the coated chicken tenders on the prepared baking sheet. If desired, spray lightly with cooking spray or drizzle with olive oil.
Bake in the preheated oven for about 20-25 minutes, or until the chicken is cooked through and the cheese is golden and bubbly. Flip the tenders halfway through baking for even cooking.
Remove from the oven and let cool for a few minutes before serving. Enjoy with your favorite dipping sauce!