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Preheat oven to 350°F.
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For sweet potatos: Wash and pierce sweet potatoes and microwave until soft.
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When cool, split skin and peel off.
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Place in mixing bowl with remaining 6 ingredients (through eggs) and beat at high speed for 2 minutes or until smooth.
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Spoon into a 13 x 9-inch baking dish coated with cooking spray.
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For Streusel: Combine streusel ingredients and sprinkle evenly over sweet potatoes.
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Bake at 350 for 30 minutes.
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Remove from oven but don't turn oven off yet.
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For Meringue: In clean mixing bowl with clean beaters, beat egg whites at high speed until soft peaks form.
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Gradually add sugar, beating until stiff peaks form.
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This takes about 4 minutes.
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Spoon meringue into a pastry bag fitted with a star tip and pipe meringue into a lattice design over streusel (or just smooth over top like a pie).
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Bake at 350°F for 15 minutes or until lightly browned.