First, preheat your oven to 425F. Then, add softened cream cheese to a large bowl and use a spatula to mash it until smooth and spreadable. Add in the buffalo wing sauce, green onion, garlic, ranch seasoning, salt & pepper and stir until combined -- it may look separated at first, but eventually it'll come together. Stir in the shredded chicken and shredded cheeses until combined.
4 oz cream cheese, ⅓ cup buffalo wing sauce, ¼ cup minced green onion, 2 garlic cloves, ½ tbsp ranch seasoning, kosher salt & black pepper, 2 cups shredded chicken breast, ½ cup shredded sharp cheddar cheese, ½ cup shredded low-moisture, part skim mozzarella cheese