01 - Boil pasta in salted water until al dente. Drain, rinse with cold water, and cool.
02 - Grill or skillet-char corn over medium-high heat until marked and tender, 8–10 minutes. Cool, then cut kernels from cobs. Sauté frozen corn in dry skillet until golden.
03 - Whisk 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 dressing. Toss until evenly coated.
05 - Gently fold crumbled cotija into salad. Adjust seasoning to taste.
06 - Refrigerate at least 15 minutes. Garnish with cilantro, lime wedges, and chili powder if desired.