Crunchy sweet potatoes

1 large can sweet potatoes (drained & mashed, approx. 3 cups) ½ cup carnation milk 1 stick margarine, melted 1/3 cup sugar 1 tsp. vanilla Mix together sweet potatoes, milk, margarine, sugar and vanilla. Pour into buttered casserole dish. Top with crunchy topping
Mix together: 1 cup brown sugar 1 cup chopped pecans 1/3 cup flour 1 cup margarine, melted