01 - Bring a large pot of salted water to boil. Cook pasta according to package directions until al dente. Drain thoroughly, rinse under cold water to stop cooking, and set aside to cool completely.
02 - Heat grill or large skillet over medium-high heat. Lightly oil corn ears and cook, turning frequently, until lightly charred and tender, about 8-10 minutes. Let cool, then cut kernels from cobs. For frozen corn, sauté in dry skillet until lightly golden.
03 - In a large mixing bowl, whisk together mayonnaise, sour cream, lime juice, chili powder, smoked paprika, cumin, salt, and black pepper until completely smooth and well combined.
04 - Add cooled pasta, corn kernels, diced bell pepper, red onion, minced jalapeño, and chopped cilantro to the dressing bowl. Toss thoroughly until all ingredients are evenly coated.
05 - Gently fold in crumbled cotija cheese. Taste the salad and adjust salt, pepper, or lime juice as needed for balanced flavor.
06 - Refrigerate salad for at least 15 minutes to allow flavors to meld. Before serving, garnish with additional cilantro, lime wedges, and extra chili powder if desired.