Heat olive oil on a large skillet over medium-high heat, then add the corn. Cook until the corn is lightly charred, stirring occasionally. This should take about 8-10 minutes.
Once charred, remove the corn from the heat and let it cool slightly.
In a large mixing bowl, combine charred corn with chopped red onion, chopped jalapeño and minced garlic.
Pour the dressing over the corn mixture and toss to combine. Add crumbled Cotija cheese, chopped cilantro and gently mix. If it is necessary, adjust with seasonings to taste.
Serve immediately or refrigerate your salad for about 4 hours before serving. Chilling is recommended, it helps the flavors meld.