Preheat your oven to 435°F: This is the first step of the recipe and involves preheating your oven to the desired temperature to prepare for roasting the corn.
Place your corn on a baking sheet and drizzle with olive oil: After husking the corn, place it on a baking sheet and drizzle with olive oil. This helps prevent the corn from sticking to the baking sheet and adds extra flavor.
Sprinkle with kosher salt and chili powder, then roast in the preheated oven for 15 minutes or until golden and cooked through: Add kosher salt and chili powder to the corn, then roast in the oven until it's cooked through and has a nice golden color.
In a small bowl, mix together the lime juice, mayonnaise, sour cream, and cotija cheese: While the corn is roasting, mix together the lime juice, mayonnaise, sour cream, and cotija cheese in a small bowl to create the sauce for the corn.
When the corn is done roasting, brush each ear with the mayonnaise mixture and sprinkle with additional chili powder: After roasting the corn, brush each ear with the sauce mixture and sprinkle with more chili powder for added flavor.
Broil for 3-5 minutes or until lightly browned and caramelized: To achieve a nice caramelized finish, broil the corn for a few minutes until it's lightly browned.
Serve warm, garnished with fresh cilantro and chili powder: Finally, serve the corn warm, garnished with fresh cilantro and chili powder for added flavor and visual appeal.