Potatoes:
4c    canned sweet potatoes
.25c  butter, melted
.5c milk
1c sugar
2 eggs beaten
1t vanilla

Topping:
1c   brown sugar
.5c  oatmeal
.5c  butter, melted
.5c  flour
1c   chopped pecans
.5c  pecan halves
2.5c mini-marshmellows

Preheat oven to 375.  Cut up sweet potatoes into bite sized chunks and place in a greased 9x12 pan.  Mix butter, milk, sugar, eggs, and vanilla - pour over potatoes.  Mix together brown sugar, oatmeal, butter, flour, and chopped pecans.  Place topping over potato mixture; place pecans on top of this - bake for 25 min.  Sprinkle mini-marshmellows on last; bake until slightly golden brown (about 5 min).