In a large pot, brown sausage. Once browned remove to a paper towel-lined plate.Add olive oil and then chopped onion. Add hashbrowns and saute for about 7 or 8 minutes or until potatoes are starting to brown and softened. Add creole seasoning while browning.Add sausage back to pot along with cream of potato soup and stir to combine.Add milk and stir. Bring soup to a boil and then reduce to simmer, stirring frequently. Soup will thicken after about 5 to 7 minutes. Once thickened, turn off heat.While soup simmers, cook bacon in a separate skillet until crispy. Remove to a paper towel and crumble once cooled.Ladle into serving bowls and top with crumbled bacon, shredded cheese, and green onions.