Fire-roast the peppers: Roast the pasilla, poblano, yellow chiles, and jalapeño over an open flame or under a broiler until charred and blistered.
Prep the peppers: Let them cool slightly, then remove the seeds and dice into small pieces.
Cook the corn (if needed): If you’re not grilling fresh corn, char your corn in a hot cast iron pan until golden with some crisp edges.
Build the base: In a large bowl, combine the corn, diced peppers, onion, and cilantro.
Add the creamy elements: Start with a spoonful of mayo, a handful of cheese, a sprinkle of Tajín, and a squeeze of lime. I also like to add extra paprika and even a little lime zest.
Taste and adjust: This is the most important step. Keep adding mayo, cheese, Tajín, and lime juice a little at a time until it tastes perfect to you. You’re looking for creamy, bright, slightly smoky, with just the right amount of heat.