Lightly mash about half the chickpeas before mixing to create a creamier texture and better binding, similar to tuna salad, while keeping some whole for pleasant texture contrast.

Lightly salt the diced red onion, bell pepper, and celery 10 minutes before mixing to draw out excess moisture and concentrate their flavors, preventing a watery sandwich.

Keep the chickpea mixture separate from the toasted bread until 15-30 minutes before eating to prevent sogginess; the salad actually improves in flavor after 4-6 hours as flavors meld.

Use equal parts vegan yogurt and apple cider vinegar (not just a splash) to create a tangy, cohesive dressing that coats every ingredient and adds moisture to compensate for the bread's absorption.

Toast your bread until deeply golden and crispy to create a protective barrier against moisture, ensuring the sandwich maintains its structural integrity throughout the day even as the filling releases juices.