Russet potatoes are highly suggested to be used in this recipe. It is a key ingredient which makes this recipe even more delicious. Russet potatoes easily dissolve into the soup mix, making it thicker and creamier. You should not mix red potatoes in this recipe as they will not easily break down and produce lumps in the soup.
For those who dislike ground beef, you can substitute this with ground chicken.
If you like your soup super-thick, you can add more cornstarch. Or, if you want runny consistency, then add cornstarch accordingly.