Supper in one step for under $3! Put the ingredients in a single pot (or skillet or baking dish) and in 30 minutes, dinner’s done!
In a large pot with a lid, bring the first 8 ingredients and the scallion whites to a boil, covered, over high. Uncover and cook 2 minutes. Off heat, add the spinach and scallion greens and stir until wilted. Divide soup among bowls.