In a 4 to 5 quart soup pot, over medium heat, bring the thawed hash browns, chicken broth and butter to a simmer. Stirring occasionally, simmer until potatoes are tender (approximately 15 minutes).
Meanwhile, create a slurry to thicken the soup by whisking together the whole milk and cornstarch.
Once the potatoes are softened, add the milk slurry, cream, cream cheese and salt and pepper. Stir continuously until the cream cheese is melted and the soup is thickened (about 5 minutes). Taste and add additional salt and pepper as needed.