Preheat your oven to 400°F. Spread the bread cubes on a baking sheet and toast in the oven for about 10-12 minutes, or until golden brown and crispy. Remove from the oven and let cool slightly.
In a large bowl, combine the chopped tomatoes, cucumber, bell pepper, red onion, and torn basil leaves.
In a small bowl, whisk together the olive oil, red wine vinegar, salt, and black pepper.
Add the toasted bread cubes to the vegetable mixture. Pour the dressing over the salad and toss gently to combine, ensuring the bread is well-coated.
Let the salad sit for at least 15 minutes before serving to allow the flavors to meld and the bread to absorb some of the dressing.
Serve at room temperature or slightly chilled.