In a large bowl, beat the sweet potatoes, sugar, eggs, milk, butter, alt and vanilla until smooth. Transfer into a greased 2 qt baking dish.
In a small bowl, combine the brown sugar, pecans and flour; cut in butter until crumbly.
Sprinkle over potato admixture. Singe, uncovered, at 325 degrees for 45- 50 twinkles.
You could also put marshmallows on this at the end of the singe and melee for a nanosecond to brown them for those that like the marshmallows on their sweet potatoes
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