Berachah for matzah ball soup

Hi,

One who eats matzah ball soup should recite a berachah of mezonot for the matzah balls, and nothing for the soup. If he wishes to drink some of the soup independently, though, then he should recite a berachah of shehakol for the soup.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:43)

Have a great day,
Mordechai