Place a cast-iron skillet over medium-high heat and char the corn kernels for 5-7 minutes until slightly blackened, then set aside to cool.
In a large mixing bowl, combine the shredded chicken, diced cucumbers, and charred corn.
In a medium bowl, whisk together the mayonnaise, sour cream, lime juice, chili powder, smoked paprika, and garlic powder until a smooth dressing forms.
Pour the dressing over the chicken mixture and toss thoroughly to ensure even coating.
Gently fold in the crumbled cotija cheese and chopped cilantro.
Season with salt and pepper to taste and refrigerate for at least 15 minutes before serving to allow flavors to meld.