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Heat oven to 350°F.
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Line a half-sheet pan with foil or parchment paper sprayed lightly with nonstick cooking spray.
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Pierce sweet potatoes well and place on sheet.
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Bake about 1 hour 15 minutes or until tender.
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Remove from heat and cool until sweet potatoes are cool enough to handle. Remove skins and remove any eyes or dark spots.
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Meanwhile, cook bacon until crispy and crumble.
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Mix bread crumbs and melted butter in a small bowl. Add chopped pecans, and set aside.
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Mash potatoes well in a large bowl with a potato masher.
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Stir in chopped bacon, sour cream, 2 tablespoons butter, the onions, salt, pepper and nutmeg until well blended.
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Spread mixture in baking dish, or form individual servings in dish with 1/2-cup ice cream scoop or measuring cup.
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Sprinkle crumb mixture evenly over top.
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Bake 20 to 30 minutes or until thoroughly heated and bread crumbs just begin to brown.
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NOTES : Save prep time by using pre-cooked bacon.
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This casserole can be made the day before. Simply cover it and refrigerate until you're ready to bake.