Preheat grill or skillet to medium-high heat if grilling your corn. If boiling, bring a large pot of water to boil.
Grill the corn kernels, turning occasionally until charred, about 10 minutes. If boiling, boil the born until tender.
To make the crema, combine the sour cream, mayonnaise, lime juice, lime zest, chili powder, cayenne pepper, and salt. Stir well and set aside.
Once the corn is cool enough to handle, carefully slice the kernels off the cob and place into a serving bowl.
Add the cotija cheese, chili powder, chopped cilantro, and chili powder to the corn bowl
Take your crema and drizzle or pour it over your corn, as heavy or light as you'd like. You can serve as is or mix it all together.
Add chopped cilantro and cotija cheese on top to garnish.