While I find that the potatoes in the chowder do an excellent job making it nice and creamy, there are a few options here. First, try adding some cashew cream to the mix. If nuts are out of the question, try using some coconut cream. Just note that your chowder will have a decidedly coconutty flavor as a result. You can also try topping the chowder with a dollop of vegan sour cream or dairy-free plain Greek yogurt.