Heat oil in a nonstick skillet over medium heat. Add bread and stir frequently until edges are brown (alternately, grill bread over low heat and tear into small pieces once browned). Transfer to a large bowl and allow to cool. Add peaches, cucumbers, tomatoes, scallions, and ¾ of the Citrus Dressing. Stir and allow to sit 10 minutes before adding greens and mint. Mix well, adding more dressing as needed to taste.