Remove husks and cut corn off from the cob.
Heat 1 Tbsp. olive oil in a large skillet over medium-high heat. Cook corn approximately 3 minutes to remove starchiness.
Transfer corn into a large bowl and set aside to cool..
Once cool, add tomatoes, onion, mozzarella, and basil.
In a small bowl, whisk together olive oil, vinegar, salt, and pepper.
Pour dressing over salad; chill until ready to serve.