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Preheat oven to 375 degrees F and grease a 9×13-inch baking dish.
In a large bowl, add sweet potato, brown sugar, half and half, butter, egg, vanilla, and salt. Beat with mixer until completely smooth.
In a small bowl combine sugar, flour, pecan, and melted butter until a crumbly mixture forms. Sprinkle over sweet potatoes.
Bake for 35 minutes, then allow dish to cool for a minimum of 20 minutes before serving.