In a 10 to 12 - inch frying pan over medium-high heat, stir onion in olive oil until limp, 5 to 7 minutes. Add corn and stir often just until tender to bite, 5 to 6 minutes.
Pour mixture into a wide serving bowl and stir in tomatoes, basil, and vinegar. Add salt and pepper to taste.
Sprinkle blue cheese over salad; serve at room temperature.
Kunde Family Winery Chardonnay