Bring a large pot of salted water to a boil. Add the pasta and cook according to package instructions until al dente. Drain and run under cold water to cool.

If using fresh corn, grill it until charred for a more authentic flavor. If using frozen, sauté in a pan for a few minutes until heated through.

In a large mixing bowl, combine the cooked pasta, corn, diced red bell pepper, red onion, and feta cheese.

In a small separate bowl, whisk together lime juice, mayonnaise, sour cream, chili powder, salt, and pepper until smooth.

Pour the dressing over the pasta mixture and toss gently until well combined.

Fold in the avocado and chopped cilantro before serving.