Place potatoes in a heavy-bottomed 3-quart saucepan. Add cold water to cover. Bring to a full, rolling boil over medium-high heat and cook for 20 minutes, or until potatoes are very soft.
While potatoes are cooking, melt butter in a heavy-bottomed 8-inch skillet over medium heat. Add onion and sauté, stirring often, until wilted and transparent, about 5 minutes. Remove from heat and set aside.
Drain potatoes in a colander and transfer to a medium-sized bowl, Add the sautéed onions and any residual butter in the skillet, the goat cheese, Lone Star Roasted Garlic and Chive Dip mix, and salt to taste. Smash the potatoes with a potato masher, incorporating the other ingredients. Leave the potatoes slightly lumpy. Serve hot.
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