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pre-heat oven to 350 degrees.
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Peel sweet potatoes and slice finely.
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put potatoes into microwaveable bowl. Add 5 T water. Cover and cook until tender (about 40 minutes).
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take out of oven and remove cover WATCH STEAM.
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let cool about 15 minutes.
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put potatoes into mixer. Combine with sugar, eggs, milk, 1/2 C butter and beat at medium speed until smooth (about 10 minutes).
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spoon into lightly greased 12 x 8 x 2 inch baking dish.
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in a small bowl combine brown sugar, pecans, flour, and 2 T butter. Crumble mixture over casserole.
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bake 350 degrees for 30 minutes (uncovered).