Preheat your oven to 375°F (190°C). Season the chicken breasts with salt and pepper.
Place the seasoned chicken breasts on a parchment-lined baking sheet and bake for 25-30 minutes until fully cooked. Allow to cool for 5 minutes before shredding.
Chop the celery and finely dice the red onion.
Shred the baked chicken into bite-sized pieces.
In a large mixing bowl, combine the shredded chicken with cottage cheese, chopped celery, diced onion, Dijon mustard, and fresh herbs. Stir until well-coated.
Taste and adjust seasoning with salt or pepper. Serve immediately or refrigerate for later use.