Preheat the oven to 400°F. Blend the cottage cheese in a food processor until smooth.
Add the cream cheese and process until the mixture is creamy, stopping to scrape down the sides if needed. Transfer the mixture to a large bowl.
Stir in the ranch mix, hot sauce, chicken, 1 cup of the Cheddar cheese, and the blue cheese.
Spoon into a 2-quart baking dish coated with cooking spray. Sprinkle with the remaining Cheddar cheese and bake for 15 to 20 minutes or until bubbly. Garnish as desired with more blue cheese, green onions, and additional buffalo sauce, if desired. Serve with chips and celery.