1 stick margarine
2 eggs
2 teaspoons vanilla
1 cup sugar
3 cups cooked, mashed sweet potatoes

Mix margarine, eggs, vanilla, and sugar together.  Add to mashed sweet potatoes.  Place in baking dish.

Topping:

1/3 stick margarine, melted
1 cup brown sugar
2 tablespoons flour
1 cup finely chopped pecans

Mix topping ingredients and crumble over potatoes.  Bake at 350 degrees for 25-30 minutes or until bubbly and golden brown.