There's just something so satisfying about a hot bowl of soup on a chilly day. This soup is simple and delicious; earthy, meaty mushrooms are combined with tender orzo in a flavorful and soothing broth. If you don't have orzo on hand, any small pasta shape will do just fine. It's important to serve this soup immediately after it's made because the orzo will soak up quite a bit of liquid if it sits around too long.