Preheat the oven to 350 degrees.
In a food processor, blend the cottage cheese and ranch seasoning until smooth.
In a large bowl, combine the shredded chicken, cottage cheese mixture, yogurt, buffalo sauce, ¾ cup cheddar cheese, and mozzarella cheese. Mix until thoroughly combined.
Transfer the dip to an oven-safe dish and top with the remaining ¼ cup of cheddar cheese. Bake for 25-30 minutes, or until the cheese is melted and the dip is bubbling.
Serve hot with celery, carrots, or tortilla chips. Sprinkle diced green onions and blue cheese on top. Enjoy!