Final answer:
The recipe involves boiling sweet potatoes, mashing them with butter, cooking green onions separately, and mixing them together to serve.
Step-by-step explanation:
To make a special mashed potato treat for two, begin by peeling two large sweet potatoes and boiling them until they can be pierced easily with a fork or knife. After draining the potatoes, mash them in a bowl with 2 tablespoons of butter until the desired consistency is reached. Separately, cook chopped green onions in melted butter for about a minute, then combine them with the mashed sweet potatoes. Optionally, additional butter can be added to taste before serving.