Cut cream cheese into small chunks. This will make melting easier.
Add all ingredients to the crockpot: chicken, cream cheese, buffalo sauce, ranch dressing, and cheddar cheese and mix to combine.
Cover and turn heat on low for 3-4 hours or high heat for 1-2 hours, stirring frequently (approximately every 30 minutes) so cream cheese will melt and mix into the mixture.
Notes
Best served warm with tortilla chips or crackers. Can be kept warm in the crockpot for several hours.