Preheat oven to 325 degrees. Boil or bake sweet potatoes until tender and set aside to cool. In a large measuring bowl, combine butter, sweet potatoes, sugars and flour. Using a metal spoon, mash all ingredients until well blended. Add eggs, heavy whipping cream, lemon juice and extracts and continue to whip until the butter is smooth and creamy. Season with cinnamon and nutmeg and pour into unbaked pie shell. Bake on center rack for 1 hour. Enjoy!
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