3 cups mashed sweet potatoes
3/4 cup sugar
1/3 cup milk
1/2 cup margarine
1 teaspoon vanilla

Topping:
1/2 cup margarine
1/3 cup flour
1 cup brown sugar
1/2 cup chopped pecans

Combine sweet potatoes, sugar, milk, margarine and vanilla, mixing well. Transfer this mixture into a 9" baking dish (8" is ok). For the topping, melt margarine and add flour, brown sugar and pecans. Mix well and sprinkle over sweet potato mixture.

Can freeze at this point, or bake at 350º for 30 minutes (after thawing out).