A friend sent me this recipe.
3 cups mashed sweet potato
3/4 cup sugar
2 eggs
1 tsp vanilla
1/3 cup milk
1 cup brown sugar
1/3 cup margarine
1/3 cup flour
1 cup pecans, chopped
Cook potatoes, mash with butter to taste. whip together with sugar, eggs, vanilla and milk. Place the whipped potatoes in a baking dish.
Combine flour and brown sugar and cut in margarine. Spread over sweet potatoes. Sprinkle with pecans. Bake 350 degrees 45 minutes.