In a bowl whisk together the mayonnaise, sour cream, Parmesan, and seasonings. Taste the sauce and add more salt or pepper to taste.
1/2 cup light mayonnaise, 1/2 cup light sour cream, 1/2 cup freshly grated Parmesan cheese, 3/4 teaspoon kosher salt, 1/2 teaspoon paprika, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/4 teaspoon black pepper