Topping:

1 c. brown sugar
1/2 c. flour
1/2 stick butter, melted
1 c. pecans, chopped

Mix together and place on top of sweet potato mixture before baking.

Filling:

1 tsp. vanilla
3 eggs
1/2 c. butter
1/2 c. milk

Mix all ingredients and spread in a 13 x 9 inch casserole dish. Top with topping and cook in 350°F oven for 30 to 35 minutes.