Preheat your oven: Set oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish.
Make the dressing: In a large bowl, whisk together the mayo, sour cream, chili powder, garlic powder, and salt.
Combine the ingredients: Gently fold in the thawed corn, 1 cup of queso fresco, and 1/2 cup of chopped cilantro.
Transfer to dish: Spread your corn mixture evenly into the prepared baking dish with a spatula for a nice top.
Bake until bubbly: Place in the preheated oven and bake for 20-25 minutes, or until it's hot and bubbly.
Garnish and serve: Top the warm casserole with the remaining queso fresco, cilantro, and a sprinkle of chili powder.
Add a fresh spritz: Serve your delicious casserole immediately with fresh lime wedges on the side for squeezing over.