Place the potatoes in a saucepan and cover with water. Bring the water to a boil and cook the potatoes until tender, about 15 minutes. Drain the potatoes and return them to the saucepan. Add the cream, 2 tbsp of the butter, 1/4 tsp salt, and the white pepper. Use a potato masher to mash the potatoes until smooth. Cover the pan with a lid and set aside until ready to use.
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