In a medium bowl, whisk together the sour cream, lime juice, and garlic powder until smooth and creamy.

Bring a large pot of salted water to a boil. Add pasta and cook according to package instructions, usually around 8-10 minutes.

Combine the drained pasta with fresh corn in a large mixing bowl. Add optional proteins if desired.

In a skillet, melt butter over medium heat, then add chili powder and salt, mixing well for about a minute.

For the optional lime mayo dressing, mix the mayonnaise with lime juice until smooth.

Transfer the pasta salad to a serving dish and drizzle with optional lime mayo dressing if prepared.