In a large pot over medium high heat melt the butter, add the flour and onions and cook until opaque.
Add the vegetable broth, water and heavy cream, stirring to combine.
Bring the mixture to a boil and then add the corn, carrots and broccoli.
Reduce to a simmer and cook the soup for a minimum of 30 minutes, adding the tortellini and chicken during the last 10 minutes, season with salt and pepper according to taste.
Serve warm.
Notes
You may want to cook the soup longer to achieve your desired level of softness with the vegetables.
Coursessoup, main dish
Recipe by It Bakes Me Happy at https://itbakesmehappy.com/2014/11/chicken-tortellini-soup.html