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). 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 well combined.
04 - Add cooled pasta, corn kernels, bell pepper, red onion, jalapeño, and cilantro to dressing. Toss thoroughly to coat all ingredients evenly.
05 - Gently fold in crumbled cotija cheese. Taste and adjust seasoning with additional salt or chili powder if needed.
06 - Refrigerate salad for at least 15 minutes before serving. Garnish with extra cilantro, lime wedges, and sprinkle of chili powder if desired.