from a very Southern woman, here's a very Southern version of the dish:

3 c. cooked, mashed sweet potatoes
1 c. sugar
1/2 c. butter
2 eggs
1 tsp. vanilla extract
1/2 c. raisins (optional)

Mix well and pour into a greased casserole dish.

Topping
1 c. brown sugar
1/3 c. butter
1 c. chopped pecans (optional)

Mix well, sprinkle over potatoes. (Optional: do a top layer of mini marshmallows over everything)

Bake in 350-degree oven for 20 minutes (marshmallows should be a light golden brown).