Preparation

• In a mixing bowl, whisk the mayonnaise, sour cream and lime juice.
  Heat oil in a large nonstick skillet or wok over high heat until shimmering. Add corn kernels, season to taste with salt, toss once or twice, and cook without moving until charred on one side, about 2 minutes. Toss corn, stir, and repeat until charred on second side, about 2 minutes longer. Continue tossing and charring until corn is well charred all over, about 10 minutes total. Transfer to a large bowl.k
  Add mayonnaise mixture, cheese, scallions, cilantro, jalapeño, garlic, and chili powder and toss to combine. Taste and adjust seasoning with salt and more chili powder to taste. Serve immediately.