In a 5-6 quart saucepan saute onion and peppers with a tablespoon of oil.
Meanwhile, cook sausage in a separate pan.
Add flour then stir to combine.
Slowly pour in milk and stir to create a thick sauce.
Add in chicken broth (or water and chicken flavor) and bring to a boil.
Add in potatoes.
Bring to a boil over medium-high heat.
Add in cabbage and carrot these don't need to cook really they are better left crunchier for a better texture.
Slice sausage, and add that to the soup along with crushed red pepper, and add salt and pepper to taste.
If the soup is not thick enough, while it's boiling add 2 tablespoons cornstarch mixed with 1/2 cup cold water and stir it'll thicken quickly. Alternatively, you can use all milk in this recipe and add chicken flavor/bouillon or add some heavy cream. It's also great with a cup of grated cheese added in.