In a large Dutch oven, combine 9 cups of chicken broth and chopped onion. Bring to a boil.
Add rice and seasoning packet ( I like ZATARAIN'S) and Reames Frozen Homestyle noodles; return to boiling. Reduce heat, cover and simmer 20 minutes.
In a small bowl, combine flour, salt, pepper and poultry seasoning. Sometimes I substitute Tony Chachere's seasoning for poultry seasoning. Just a little kick! Either way its great. Whisk in remaining cup of broth until smooth.
Remove soup from burner and slowly add flour / broth mixture to soup, stirring constantly. Bring to a boil; cook about 3 minutes or until thickened and bubbly.
Slowly add half and half to cooked soup; stirring constantly. Add turkey; heat through.