Preheat oven to 375 degrees F.
Arrange bread on a large, flat baking tray. Spray with oil and season with salt and pepper. Toss bread pieces gently to coat, spraying with more oil if necessary. Bake for 8-10 minutes or until light golden. Set aside to cool completely.
Tear lettuce leaves into small pieces and place in a large bowl. Add bacon and croutons. Pour dressing over salad just before serving. Season with salt and pepper. Toss gently to combine. Top with Parmesan.