01 - Bring a large pot of salted water to boil. Cook pasta according to package directions until al dente. Drain, rinse under cold water, and set aside to cool completely.
02 - Heat grill or large skillet over medium-high heat. Lightly oil corn cobs and cook, turning occasionally, until charred in spots and tender, 8 to 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 smooth and well combined.
04 - Add cooled pasta, corn kernels, bell pepper, red onion, jalapeño, and cilantro to the bowl with dressing. Toss thoroughly until all ingredients are evenly coated.
05 - Gently fold in crumbled cotija cheese. Taste and adjust seasoning with additional salt or pepper if needed.
06 - Refrigerate salad for at least 15 minutes to allow flavors to meld. Garnish with extra cilantro, lime wedges, and sprinkle of chili powder before serving.