Bring a large pot of salted water to a boil over medium-high heat. Add the ears of corn and cook until tender, about 10 minutes (or cook them in the instant pot).
(Optional step): Brush corn with melted butter and grill corn on medium heat until slightly charred.
Mix the mayonnaise and Mexican crema together and spread a thin layer all around the corn ears.
Sprinkle generously with cotija cheese and then desired amount of chili powder. Serve garnished with cilantro, and with a lime wedge on the side for squeezing on top.
Enjoy immediately.
