Step 1: Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper or foil.
Step 2: In a shallow bowl, combine ranch seasoning mix, panko breadcrumbs, Parmesan cheese, garlic powder, and black pepper.
Step 3: Brush chicken breasts lightly with olive oil on both sides.
Step 4: Dredge each chicken breast in the ranch mixture, pressing gently to coat evenly on all sides.
Step 5: Place coated chicken on prepared baking sheet and lightly spray tops with cooking spray.
Step 6: Bake for 25-30 minutes until chicken reaches internal temperature of 165°F (74°C) and crust is golden brown.
Step 7: Let rest for 5 minutes before serving to allow juices to redistribute.