01 - Cook pasta in a large pot of boiling salted water until al dente. Drain, rinse with cold water, and set aside.
02 - Grill fresh corn on a hot grill or grill pan, rotating often, until lightly charred on all sides, about 8 to 10 minutes. Let cool, then cut kernels off the cobs. For frozen corn, sauté in a dry skillet over high heat until lightly charred.
03 - In a large mixing bowl, whisk together mayonnaise, sour cream, lime juice, chili powder, smoked paprika, cumin, salt, and black pepper until fully combined.
04 - Add cooked pasta, charred corn kernels, red bell pepper, green onions, cilantro, Cotija cheese, and jalapeño to the bowl with the dressing. Toss thoroughly to coat all ingredients evenly.
05 - Taste and adjust seasoning if needed. Cover and refrigerate for at least 30 minutes to allow flavors to meld before serving.