In a 2QT slow cooker, combine the shredded chicken, buffalo sauce, softened cream cheese, ranch dressing, sliced green onions, garlic powder, and 1 1/2 cups of the shredded cheddar cheese.
Once the dip is hot and the ingredients are melted together, sprinkle the remaining 1/2 cup of shredded cheddar cheese on top. Cover the slow cooker and let the cheese melt for about 15 minutes before serving.