In a shallow dish, stir together the breadcrumbs and 2 tablespoons basil. In a separate shallow dish, add the buttermilk; in a third dish, add the flour. Season the chicken with salt and pepper. Working with 1 piece at a time, coat the chicken in the flour, then dip into the buttermilk and coat with the breadcrumbs,
shaking to remove any excess.
In a large skillet, heat 1/4 cup olive oil over medium-high heat. Add the chicken and cook, turning once, until golden-brown, about 5 minutes; drain on paper towels.
In a large bowl, stir together the corn, tomatoes, onion, the remaining 2 tablespoons basil and 1 tablespoon olive oil; season with salt and pepper. Serve over the chicken.