Rinse and drain the canned chickpeas, then place them in a mixing bowl. Use a potato masher to roughly mash the chickpeas until creamy but still chunky.
Fold in the chopped dill pickles, purple onion, Just Mayo or Vegenaise, stone ground mustard, apple cider vinegar, fresh dill, salt, and black pepper until well combined.
Chill the mixture in the refrigerator for at least 30 minutes to enhance flavors.
Spread generous amounts of the chickpea salad onto slices of multigrain or gluten-free bread.
Layer with any additional toppings such as sprouts, kale, shredded carrots, lettuce, or tomatoes.
Close the sandwich with another slice of bread and slice diagonally for serving.