Baked Tilapia Parmesan

Parmesan cheese 1/4 cup butter softened 4 tablespoons mayonnaise 2 tablespoons lemon juice 1/4 teaspoon dried parsley 1/4 teaspoon ground black pepper 1/4 teaspoon garlic salt 1/8 teaspoon onion powder 1/8 teaspoon celery salt 2 pounds tilapia fillets