Sweet Potato Casserole

3 c mashed sweet potatoes
1/2 c sugar
1/2 c brown sugar
1/2 c butter
2 eggs
1 tsp vanilla
1/3 c milk
Mix and dump in 13x9 pan

1/3 c melted butter
1 c brown sugar
1/2 c flour
1 c chopped nuts
Crumble on top and bake at 350° for 25 mins.