The Best Sweet Potato Pie

1 can of yams (the BIG one)
.5 c. sugar
2 eggs
1tsp. vanilla
.25 c. butter (half a stick)
1tsp. cinnamon
.5 tsp. nutmeg


topping:
.5 c. brown sugar
1 c. walnuts
.33 c. flour
.75 c. melted butter

bake at 350 for a half hour.