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Boil potatoes for 15 minutes or until tender. You should be able to easily poke through them with a fork.
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Preheat oven to 350 degrees.
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Drain and put into a large bowl.
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Add milk, sour cream, butter, salt and pepper.
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Beat with mixer on low speed for one minute, then on high until no lumps remains.
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Stir in 1 1/2 cups cheese and the bacon.
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Transfer to a 3qt baking dish.
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Top with remaining cheese.
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Bake for 20 minutes.
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Remove and then let sit for 10 minutes.