01 - Bring a large pot of salted water to a boil. Cook pasta according to package directions until al dente. Drain thoroughly, rinse with cold water to stop cooking, and set aside to cool completely.
02 - Preheat grill or large skillet over medium-high heat. Lightly oil corn ears and cook, turning frequently, until kernels are charred in spots and tender, about 8-10 minutes. Allow to 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, charred corn kernels, diced bell pepper, red onion, minced jalapeño, and chopped cilantro to the dressing. Toss thoroughly until all ingredients are evenly coated.
05 - Gently fold in crumbled cotija cheese, being careful not to break down the cheese too much. Taste and adjust seasoning with additional salt or chili powder if needed.
06 - Refrigerate salad for at least 15 minutes to allow flavors to meld. Before serving, garnish with additional cilantro, lime wedges, and a light sprinkle of chili powder if desired.