The best remedy for this is to blend the soup without most of the broth so it's very thick initially, then adding the broth back in to make it the consistency and thickness you want. If you've blended your soup and it still is too watery for your liking return it to the pot and continue to cook. As it simmers, water will evaporate and leave you with a thicker soup. Be sure to stir every now and then so it doesn't burn.