Place the chickpeas in a food processor and pulse until crumbly.
Place the smashed chickpeas in a large bowl. Add the apple, carrots, scallions, walnuts, dried cranberries, cottage cheese, Greek yogurt, lemon juice and salt. Stir until well combined.
When you’re ready to serve, toast two slices of whole grain bread and scoop ⅓ mixture onto the bread. Top with 1-2 bibbed lettuce leaves, close the sandwich and enjoy.