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Preheat oven to 375 degrees.
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Place potatoes in large pot of water and cook until tender.
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Drain, cool slightly and peel.
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Cut into chunks.
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Combine the half-and-half and next 4 ingredients in a large bowl, stirring with a whisk.
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Add potato to egg mixture, beat with a mixer at medium speed until smooth.
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Spoon potato mixture into a 13 x 9-inch baking dish coated with cooking spray.
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Combine flour and sugar in a food processor; pulse to combine.
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Add chilled butter, pulse until mixture resembles coarse meal.
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Stir in pecans; sprinkle over potato mixture.
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Cover and bake at 375 degrees for 15 minutes.
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Uncover and bake 25 minutes more or until the topping is browned and the potatoes are heated through.