Roast corn in oven at 350°F for 35 minutes. Let cool and slice kernels off cob.
Cook pasta according to package directions, then rinse with cold water.
In a bowl, whisk mayo, sour cream, lime juice, chili powder, and garlic powder to make your mexican crema dressing
Combine pasta, corn, avocado, jalapeño, cilantro, black beans, and cotija cheese.
Add crema dressing and toss gently until fully coated.
Chill for at least 30 minutes before serving.