Preheat your oven to 400°F. In a large shallow dish or plate, mix together the breadcrumbs, Parmesan cheese, garlic powder, salt, pepper, and paprika. Set aside.

- Using a sharp knife, carefully slice each chicken breast in half lengthwise to create thin fillets. Place the fillets between two pieces of plastic wrap on a cutting board, and use a meat tenderizer to gently pound them to about ⅜-inch thick.

- Coat both sides of the chicken fillets with mayonnaise, ensuring an even layer. Dredge each fillet in the breadcrumb mixture, then arrange them on a baking sheet coated with cooking spray.

- Bake for 17-20 minutes, or until the chicken is fully cooked and the coating is golden and crispy.