Sweet Potato Casserole (REALLY YUMMY)

6 sweet potatoes or 1 large can sweet potatoes
1/4 cup butter
1/4 cup sugar
1/4 cup milk
2 eggs, beaten
2 tsp. vanilla

Topping:
1 cup brown sugar
1/2 cup flour
1 cup chopped pecans
1/2 stick butter

Cook the sweet potatoes. Whether they are fresh or canned, reserve 3/4 cup of the cooking liquid. To reserved liquid add the other (non-topping) ingredients. Add in potatoes. Mash the mixture. Put in a 9x13 inch dish.
Topping: Mix the sugar, flour and pecans of the topping recipe. Sprinkle this over potatoes. Drizzle on butter. Bake at 350 degrees for 30 minutes, or until hot.