World's Best Sweet Potato Casserole!!

3 cups mashed sweet potatoes
1 cup white sugar
2 eggs
1 Tablespoon vanilla
1/2 cup butter
1/3 cup milk

Mix all of the above ingredients well. Spoon into buttered baking dish (9x9).

In a separate bowl, mix topping:

1 cup brown sugar
1/3 cup flour
1/3 cup butter

Stir in:
1 cup chopped pecans

Sprinkle over sweet potato mixture. Bake at 350 for 30 minutes.