Preheat your oven to 400ºF.
In a blender or with an immersion blender, combine the cottage cheese and Greek yogurt with the Buffalo hot sauce, onion powder, and garlic powder until smooth.
Transfer the mixture to a large mixing bowl and add the shredded chicken and chopped celery. Mix well.
Stir in ¾ cup of the shredded mozzarella, reserving ¼ cup for topping later.
Pour the chicken mixture into a lightly greased medium-sized baking dish, such as an 11-inch oval gratin pan or an 8x8 or 9x9 square baking dish.
Sprinkle the reserved mozzarella and the crumbled blue cheese on top.
Bake in the preheated oven for about 20 minutes, or until the cheese is melted and the dip is bubbling.
For an extra melty and lightly browned finish, broil for an additional 5 minutes after baking.
Garnish with sliced green onions and additional Buffalo sauce to taste.
Serve with your choice of vegetables, chips, or crackers.
