1. Step
Preheat oven to 350 degrees F. Heat oil in a large skillet over high heat until hot but not smoking. Add corn and jalapño and cook, without stirring, until lightly charred, about 3 minutes. Stir and cook for another 3 minutes. Transfer the mixture to a medium bowl. Stir in mayonnaise, crema (or sour cream), lime juice, chili powder and 1/2 cup queso fresco.