In a small bowl, mash a ripe avocado until smooth. Grab your 4 slices of sourdough and assemble the 2 sandwiches. You can toast your bread if you would like.
Divide the mashed avocado spread evenly. Spread the mashed avocado onto 2 slices of bread. Divide the chickpea salad evenly and spread the mixture onto each slice of bread.