My favorite is a good old chicken soup. I load mine up with fresh ginger, a bit of rice wine, star anise, and a cinnamon stick. Nothing's better to bust a cold.
I'm also a big fan of caldo verde, a Portuguese soup with linguica sausage, kale, and potatoes. I usually sub kielbasa for the linguica, which is easier to find. Simple, hearty, and delicious.
Recipe from Serious Eats:
https://www.seriouseats.com/caldo-verde-portuguese-potato-kale-soup-recipe