Preheat oven to 375°F. With serrated knife, cut kernels from ears of corn. You should have about 5 cups. Spread corn in single layer on rimmed baking pan. Roast 40-45 minutes or until golden brown, stirring twice; cool in pan on wire rack.
Meanwhile, from 2 limes, squeeze 1/4 cup juice. Cut remaining lime into wedges for serving. In large bowl, combine onion, chiles, 1 cup cheese, cilantro, mayonnaise, sour cream, garlic, chili powder, salt, cayenne pepper and lime juice.
Add corn to mayonnaise mixture; toss until well combined. Serve corn salad sprinkled with remaining 1/2 cup cheese and lime wedges.
Cook’s Wisdom
Corn salad can be prepared, covered and refrigerated up to 1 day.
Cut lime into wedges and sprinkle with cheese just before serving