I really enjoy soups, and have been working on how to make them. I have been making a soup where I boil potatoes, and onions, then drain the water off. Add milk, corn starch, and allow it to heat up (but not boil). Butter, thyme, parsely, and sour cream is added with cheese. The soups flavor is okay, but there is an odd grainy texture to the soup. Not sure what is causing that. If you have any good basic soup potato soup recipes, could you please share them?