Cook pasta until al dente; drain and cool.
Heat oil in a skillet; char corn for 5–7 minutes.
Whisk mayonnaise, sour cream, lime juice, chili powder, paprika, garlic powder, salt, and pepper.
Taste and adjust dressing with lime or salt.
Combine pasta, corn, cotija, cilantro, onion, and jalapeño; toss with dressing.
Chill for 30 minutes (optional).
Serve in a white ceramic bowl with chips or chicken.