Bring a large pot of salted water to a boil and cook pasta until al dente according to package instructions.
Drain the pasta and rinse under cold running water until cooled, then set aside.
Place corn kernels in a dry cast-iron skillet over medium-high heat and cook for 5 to 7 minutes until lightly charred, stirring occasionally.
In a large mixing bowl, whisk together mayonnaise, Mexican crema, lime juice, minced garlic, chili powder, and smoked paprika until smooth.
Incorporate the cooled pasta and charred corn into the dressing bowl.
Add the crumbled cotija cheese, chopped cilantro, and sliced green onions.
Fold all ingredients together until the pasta is evenly coated with the dressing.
Season with salt and pepper to taste and refrigerate for a minimum of 30 minutes prior to service to allow flavors to meld.