01 - Cook pasta in large pot of salted boiling water according to package directions until al dente. Drain, rinse with cold water, and set aside to cool completely.
02 - Preheat grill or large skillet over medium-high heat. Lightly oil corn and cook, turning occasionally, until charred in spots and tender, 8-10 minutes. Let cool, then cut kernels from cobs. If using frozen corn, sauté in dry skillet until lightly golden.
03 - Whisk together mayonnaise, sour cream, lime juice, chili powder, smoked paprika, cumin, salt, and black pepper in large mixing bowl until smooth and creamy.
04 - Add cooled pasta, corn kernels, bell pepper, red onion, jalapeño, and cilantro to dressing bowl. Toss well until all ingredients are evenly coated.
05 - Gently fold in crumbled cotija cheese. Taste and adjust seasoning with additional salt and pepper if needed.
06 - Refrigerate salad for at least 15 minutes before serving to allow flavors to meld. Garnish with additional cilantro, lime wedges, and sprinkle of chili powder if desired.