Sweet Potato Souffle
["3 c. cooked, mashed sweet potatoes", "1 c. sugar", "1/4 c. milk", "2 eggs", "1 tsp. vanilla", "1 stick margarine", "1/3 c. flour", "1 tsp. cinnamon", "1/2 tsp. grated orange peel", "2 Tbsp. thawed orange juice concentrate", "1 c. chopped nuts", "1 c. brown sugar", "1 stick margarine", "1/3 c. flour"]
["Bake at 350\u00b0 for 40 minutes."]
["potatoes", "sugar", "milk", "eggs", "vanilla", "margarine", "flour", "cinnamon", "orange juice", "nuts", "brown sugar", "margarine", "flour"]