Start by boiling water and salting it well. Once it is bubbling, add your rotini and cook until just al dente, tasting a minute before the package suggests to avoid overcooking which can lead to mushiness.
While the pasta cooks, heat 2 teaspoons of olive oil in a skillet. Add the frozen corn and sauté until warmed through and slightly charred, around five minutes for that lovely smoky flavor. Work in batches if necessary to avoid overcrowding the pan.
In a large bowl, whisk together sour cream, mayonnaise, chili powder, garlic powder, cayenne, lime juice, lime zest, and a sprinkle of Kosher salt and pepper. Whisk thoroughly to blend the flavors.
Once the pasta is cooked and drained, toss it into the bowl with the creamy sauce while it is still warm, allowing the sauce to cling beautifully to the pasta.
Gently fold in the charred corn and crumbled Cotija cheese. Take care not to overmix to preserve the textures of the corn and cheese.
Finally, toss in the chopped cilantro, adding freshness to the salad. If you prefer, you can skip this step or substitute with another herb.
Allow the salad to chill in the fridge. Avoid adding the Cotija cheese until you are ready to serve to maintain its freshness. Taste and adjust seasoning if needed before serving.