Spray inside of slow cooker with non stick spray. In a bowl blend together room temp. cream cheese, ranch dressing, sour cream and blue cheese.
Spread this mixture into the bottom of the Crockpot, top this with precooked shredded chicken. Pour buffalo sauce on top with 1 cup of your cheese on the very top.
Cover and cook on low for 2-3 hours or until the cheese on top has melted and dip is warmed in the center. Uncover and top with rest of your cheese. Serve with veggies and chips.