01 - Cook pasta in large pot of salted boiling water until al dente. Drain, rinse with cold water, and set aside to cool.
02 - Preheat grill or skillet over medium-high heat. Lightly oil corn and cook, turning occasionally, until charred and tender (8-10 minutes). Cool and cut kernels from cobs. For frozen corn, sauté in dry skillet until lightly golden.
03 - Whisk together mayonnaise, sour cream, lime juice, chili powder, smoked paprika, cumin, salt, and pepper until smooth.
04 - Add cooled pasta, corn, bell pepper, onion, jalapeño, and cilantro to bowl. Toss well to coat evenly with dressing.
05 - Gently fold in crumbled cotija cheese. Taste and adjust seasoning as needed.
06 - Refrigerate salad at least 15 minutes before serving. Garnish with extra cilantro, lime wedges, and chili powder if desired.