Preheat oven to 375 degrees. Toss the cubed bread with ¼ cup of olive oil and ½ teaspoon of salt. Place onto baking sheet.
Once oven is preheated, place sheet into oven to bake for 6 minutes. Remove pan and then toss the bread around and bake for another 6 minutes or until the bread has toasted and turned golden brown. Remove from oven and turn oven off.
Toss the bread in the dressing (recipe below). Add halved tomatoes, diced cucumber, and diced onion. Toss together. Top with sliced basil. Let salad sit for 30 minutes to 1 hour to help the bread absorb the dressing. Serve within 24 hours for optimal freshness.