Boil the pasta to al dente according to package instructions. Drain and rinse with cold water to stop cooking.

Prepare the corn: grill for a smoky flavor, boil for simplicity, or sauté briefly if using frozen or canned corn.

Make the dressing: whisk together equal parts mayonnaise and sour cream, adding lime juice gradually, then season with chili powder, salt, and pepper to taste.

In a large bowl, combine the cooked pasta and corn, then pour the dressing over the mixture and gently fold to coat evenly.

Top with cotija cheese, cilantro, and a sprinkle of chili powder before serving.