Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the softened cream cheese and buffalo sauce until smooth.
Add in the ranch dressing and mix well.
Stir in the shredded chicken until evenly coated.
Fold in the shredded cheddar cheese and blue cheese, if using.
Transfer the mixture to a baking dish and spread evenly.
Bake in the preheated oven for 20 minutes or until hot and bubbly.
Remove from the oven and let it cool slightly.
Garnish with chopped green onions.
Serve warm with tortilla chips, celery sticks, or carrot sticks.