Getting the right consistency with potatoes can be a challenge. If your potatoes are too thick, try adding milk, just a quarter-cup at a time and mixing well until it reaches the consistency you would like.  If your potatoes are too thin, you can try cooking them on your stovetop just a little longer to cook off some excess liquid. If you attempt this, do it at a very low temperature. You could also boil and add more potatoes to your mixture.