Cook the pasta: Bring a large pot of salted water to boil. Cook pasta until al dente (8-10 minutes). Drain, rinse with cold water, and toss with olive oil. Set aside to cool.
Char the corn: Grill fresh corn cobs for 10-12 minutes until charred, then cut kernels off. OR char corn kernels in a hot cast-iron skillet for 8-10 minutes. Let cool completely.
Make the dressing: Whisk together mayonnaise, Mexican crema, lime juice, lime zest, garlic powder, chili powder, smoked paprika, cumin, and cayenne pepper. Season with salt and pepper to taste.
Combine everything: In a large bowl, mix cooled pasta, charred corn, red onion, cilantro, jalapeño, and half the cotija cheese. Pour dressing over and toss until well coated.
Garnish and serve: Top with remaining cotija cheese and fresh cilantro. Serve immediately or refrigerate until ready to serve.
Notes
Serve cold or at room temperature. Great for parties; can be made ahead and chilled.