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In a large pot of lightly salted boiling water, cook the potatoes, garlic, and bouillon until potatoes are tender but firm, about 15 minutes. Drain, reserving water. In a bowl, mash potatoes with sour cream and cream cheese, adding reserved water as needed to attain desired consistency.
Transfer the potato mixture to a slow cooker, cover, and cook on Low for 2 to 3 hours. Just before serving, stir in butter and season with salt and pepper to taste.