Heat vegetable oil in a large skillet over medium-high heat until shimmering.
Add corn, season with salt to taste and toss, then let cook, tossing only occasionally (about every 2 minutes) until corn is well charred all over (about 6 - 9 minutes total).
Add corn to a medium bowl along with, avocados, onions, cilantro, jalapeno, garlic, Cotija, mayonnaise, and lime juice and chili powder and toss.
Serve immediately with more chili powder to taste as desired.
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