Cook the pasta to al dente, according to package instructions. Drain and transfer to a large bowl. Allow the pasta to cool on the counter or in the fridge while you prepare the corn.
Cook the corn. Melt the butter in a large skillet over medium-high heat. Add the corn and cook, stirring occasionally, for about 10 minutes until lightly golden and charred in places. Set aside to cool for several minutes until cool to the touch. (See Notes below for alternative ways to cook the corn.)
Make the dressing. In a small bowl, whisk together lime juice, mayonnaise, Mexican crema, garlic powder, salt, and cayenne pepper.
Assemble. Add the dressing, cooked corn, cilantro, and cotija cheese to the bowl of pasta and toss together to combine.
Serve. Top with additional cilantro, cotija cheese, and chili lime seasoning if desired. Serve immediately or refrigerate until ready to eat.
Notes
To grill the corn: Brush each husked ear with vegetable oil and grill over medium-high heat for 2-3 minutes per side until cooked through and charred in spots. Let cool, then cut the kernels off the cob.
To boil the corn: Bring a large pot of water to a boil. Add the husked ears of corn and cook for 5 minutes until tender and bright yellow. Let cool, then cut the kernels off the cob.
Storage: Store in an airtight container in the refrigerator for up to 4 days.