Add cottage cheese, lemon juice, salt, and pepper into a blender. Blend for 15 seconds until smooth.
Make the chicken salad:
In a large bowl, combine the shredded cooked chicken, the chopped celery, and the chopped shallot (if using). Pour the blended cottage cheese dressing on top, and mix it well to coat all the chicken.
Serve immediately or refrigerate for an hour to chill.
Store:
Refrigerate this cottage cheese chicken salad in an airtight container for up to 3 days.