Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
Pat the chicken tenders dry with paper towels.
In one shallow bowl, whisk together the egg and milk.
In another bowl, combine the panko breadcrumbs, Parmesan cheese, ranch seasoning, garlic powder, onion powder, paprika, and black pepper.
Lightly coat the chicken tenders with olive oil.
Dip each tender into the egg mixture, then coat evenly in the breadcrumb mixture, pressing gently so the coating sticks.
Arrange the coated chicken tenders on the prepared baking sheet in a single layer.
Lightly spray the tops with cooking spray.
Bake for 18 to 20 minutes, flipping halfway through, until golden brown and the internal temperature reaches 165°F (74°C).
Let the chicken tenders rest for 5 minutes before serving.
Garnish with chopped parsley if desired and serve with your favorite dipping sauce.