Creating 4 ingredient potato soup is a journey through simplicity. Begin by sautéing onions in butter until translucent. Add diced potatoes, pour in the broth, and let the mixture simmer until the potatoes are tender. The final step is to blend or mash the soup to your desired consistency, creating a creamy, comforting bowl of goodness. For an extra touch of richness, a dollop of cream or a sprinkle of cheese can be added before serving.