First, preheat the oven to 350℉.
In a bowl or the baking dish, combine the corn, mayo, sour cream, cilantro, salt and garlic powder. Pat it down then place in the oven.
Bake for 40 minutes then remove from the oven. Top the dish with the crumbled cheese and the tajín. I recommend to use those at the end because it's very common for Mexican dishes to have an element of a fresh, uncooked ingredient.
Lastly, once cooled a bit, serve.