Brown andouille sausage in oil in a pot over medium-high heat, 2 minutes per side. I like to keep the drippings for flavor, but if you want less fat, remove sausage and drain on paper towel and dispose of the fat into the trash can.
Add the pieces of leeks, bell pepper, garlic, and onion to bottom. Cook til soft, about 10 mins, covered, on medium-low heat.
To help prevent lumps, in a separate bowl, whisk ½ c milk with 2 T of flour. Turn heat to medium under the pot and drizzle the flour/milk mixture, whisking rapidly. Let simmer 2 minutes while stirring.
Add in broth, carrots, and potatoes, partially cover, creole seasoning, and bring soup to a boil.
Reduce heat and simmer soup until potatoes are fork-tender, about 12 minutes.
Stir in cream, leeks, corn, and sausage. Add pepper and hot sauce to taste. Serve warm.
If chowder is too thick, add ¼ c. of water and gently incorporate with a wooden spoon.