Rinse and drain the canned black olives, black beans, kidney beans and garbanzo beans and set aside.
Cut the bell peppers and remove seeds and ribs. Chop the peppers up into ½ inch pieces.
Cut the jalapeño in half lengthwise and remove all seeds. Then, rinse the jalapeño and dice it up.
Dice up ⅓ cup of red onion.
Finely chop the parsley.
Slice the grape tomatoes into quarters.
Place all of the Rainbow Three Bean Salad Ingredients into a large bowl and toss to combine.
Add salad dressing and toss again until bean and vegetable mixture is covered with the dressing.
For best results, cover and place in refrigerator to allow to marinate in dressing for at least 2 hours.