Warm a large stock pot over medium high heat. Add butter to pot. Once butter starts to melt, whisk in flour.
Slowly and gradually pour in chicken stock, while whisking continuously. Continue whisking as you incorporate sour cream and cream cheese. Whisk until mixture comes together.
Slice baked potatoes in half and scoop out the flesh, then add it to the pot.
Using a potato masher or wooden spoon, smash the potatoes until desired consistency is reached. I like my soup kind of chunky. Add sharp white cheddar cheese, salt and pepper and stir until cheese is melted.
Top with crumbled bacon, mild cheddar cheese and chives. Serve and enjoy!