- Preheat oven to 325 degrees F (165 degrees C). Put sweet potatoes in a medium saucepan with water to cover. Cook over medium high heat until tender; drain and mash.
- In a large bowl, mix together the sweet potatoes, white sugar, eggs, salt, butter, milk and vanilla extract. Mix until smooth. Transfer to a 9×13 inch baking dish.
- In medium bowl, mix the brown sugar and flour. Cut in the butter until the mixture is coarse. Stir in the pecans. Sprinkle the mixture over the sweet potato mixture.
- Bake in the preheated oven 30 minutes, or until the topping is lightly brown.