1. For each soup, start by putting butter, onion, and the seasoning in a saucepan. Cook over medium-high heat until onion is soft, about 6 minutes. Stir in the broth and the vegetables, bring to a boil, and cook for 5 minutes. Remove from heat, puree in blender in 2 batches, and return to saucepan. Reheat, and stir in milk.