If you haven't cooked the sorghum, start cooking it now while you prep the other veggies.Heat oil in a large Dutch oven over medium heat. Add onion and next 5 ingredients (through bay leaf). Cook, stirring frequently, until onions tender, about 7-10 minutes.Stir in broth and next 6 ingredients (through tomatoes). Bring to a boil.Stir in Swiss Chard and sorghum. Cook until chard wilts about 2 minutes. Stir in green onions.Serve and top with Parmesan if desired.