In a medium bowl, whisk together all the ingredients for the dressing.
In a large bowl, gently mix together the beans, cucumber, tomato, bell pepper, olives, parsley, red onion and basil.
Pour the dressing onto the salad and toss until everything is evenly coated.
Fold in the crumbled feta.
For best flavour, cover the salad and let it rest in the refrigerator for at least 2 hours.
Store leftovers in a sealed container in the refrigerator and eat within 4 days.
