In a mixing bowl, add the drained and rinsed chickpeas. Use a fork or a potato masher to partially mash the chickpeas, leaving some whole for texture.
Add the mashed avocado to the bowl with the chickpeas. Mix well until combined.
Stir in the chopped red onion, celery, bell pepper, and cilantro until evenly distributed.
Squeeze in the lemon juice and season with garlic powder, salt, and pepper. Mix thoroughly to combine all the flavors.
Toast the slices of whole grain bread until golden brown.
To assemble, place a generous scoop of the chickpea avocado salad on two slices of toasted bread, add lettuce leaves if desired, and top with the remaining slices of bread.
Cut the sandwiches in half and serve immediately, or wrap them up for a tasty lunch on the go!
Notes
Serve the sandwiches on a wooden board with some extra cilantro scattered around and a side of pickle spears for a pop of color.