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).: The steam and rising heat will fill the kitchen with a faint sweet kernel aroma as the water nears a rolling boil, signaling it is ready. Salting the water seasons the corn from within, intensifying its natural sweetness, and you will notice small bubbles grow into a steady roar when the pot is hot enough. A common mistake is under-salting or waiting too long to add the ears which can lead to uneven cooking. If your water is just simmering the kernels may cook unevenly, so aim for a lively boil.
(Optional step): Brush corn with melted butter and grill corn on medium heat until slightly charred.: As the corn steams in the hot water you will hear a softer simmer and smell a concentrated sweet corn fragrance, the kernels becoming plump and yielding slightly when pressed. Cook time will give you tender but not mushy kernels; overcooking leads to waterlogged texture and dull flavor. A typical pitfall is leaving the ears in too long which causes them to lose their snap, so test by piercing a kernel with a knife around the 8 minute mark if you want extra control.
Mix the mayonnaise and Mexican crema together and spread a thin layer all around the corn ears.: Using an Instant Pot concentrates steam, producing evenly cooked kernels with less hands on time, and when the cooker releases you will be greeted by a warm, corn forward scent. This method is great for making several ears quickly and saves stovetop space, but remember to release pressure according to your machine’s instructions to avoid overcooking. A common error is skipping the quick release for too long, which continues to cook and softens the texture beyond desired.
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.: When you move the ears to the grill the sizzle and kiss of flame add smoky notes and caramelized bits that deepen the flavor dramatically, and you will see small brown patches appear as sugars char. These visual cues are important, aim for light charring rather than blackened spots so the kernels keep their sweetness. People sometimes grill on too high heat which causes flare ups and uneven charring, so watch the ears closely and rotate frequently for an even finish.
Enjoy immediately.: The mixture should be smooth and spreadable, with a cool, slightly tangy scent that contrasts the warm corn . Applying a thin, even coat ensures the cheese and spices stick without overshadowing the kernel’s flavor. Over-applying is a frequent mistake, creating a heavy mouthfeel, so aim for a light, adhesive layer that clings to the ridges of the ears for balanced coverage.
Sprinkle generously with cotija cheese and then desired amount of chili powder: As you press the crumbly cheese into the creamy coating it adheres and creates a pleasing, slightly gritty texture against the soft kernels, and the chili powder adds aromatic heat and a vibrant color contrast. Pressing the cheese with your hand helps it cling and ensures every bite has some of that salty, tangy note. A common oversight is using too fine a grate so the cheese becomes powdery; a crumbly texture is what gives that characteristic mouthfeel.
Serve garnished with cilantro, and with a lime wedge on the side for squeezing on top: The bright citrus oils from the lime wake up the other flavors when squeezed, and the chopped cilantro adds a fragrant herbal lift that finishes the plate. Serve immediately so the contrast between warm corn and cool toppings is preserved. Waiting too long to serve can make the toppings slide off as condensation forms, so plate and present quickly for the best texture.
Enjoy immediately: The harmony of warm, sweet corn , creamy spread, crumbly cheese , and bright lime is at its peak when eaten right away, with the mix of textures and temperatures creating a lively bite. Eating them fresh preserves the intended contrast and makes the experience most memorable. The main mistake is postponing serving which diminishes the sensory interplay; when you assemble, plan to share right away.