Preheat your oven to 375°F. In a large pot over medium heat, combine the softened cream cheese and ranch dressing, stirring frequently until completely smooth and well combined, about 3-4 minutes. The cream cheese should melt seamlessly into the dressing without any lumps. I like to use a whisk here to break up any remaining cream cheese chunks and create a silky base for the dip.
While the cream cheese mixture heats, combine the shredded chicken and hot sauce in a separate bowl, stirring until every piece of chicken is well coated. This ensures even distribution of flavor throughout the dip. I always taste a small piece at this stage to make sure the heat level is right for your crowd—you can add more hot sauce if you want it spicier.
Pour the hot sauce and chicken mixture from Step 2 into the cream cheese base from Step 1, stirring until fully incorporated. Add the garlic powder, then fold in the shredded cheddar cheese and crumbled blue cheese, mixing until everything is evenly distributed. The combination of sharp cheddar and tangy blue cheese creates the signature buffalo dip flavor profile.
Transfer the entire dip mixture to a baking dish (9x13 inch or similar size works well) and bake at 375°F for 25 minutes until the mixture is heated through and begins to bubble around the edges. The dip should be hot and creamy but not yet browned on top.
Remove the dip from the oven and generously sprinkle the remaining shredded cheddar cheese over the top to create a golden, melted crust. Return to the oven and bake for another 5-10 minutes until the cheese is melted and lightly golden on top.
Remove the dip from the oven and let it rest for 10 minutes—this allows the sauce to set slightly so it holds together better when scooped. Transfer to a serving bowl or leave in the baking dish, and serve warm with celery sticks, crackers, or tortilla chips for dipping.