Mix all ingredients into mashed potatoes.
Pour into casserole and bake in 400 degree(F) oven for 20 minutes (I find it takes longer, especially if you are doubling but watch it.)
TOPPING:
Melt 3/4 cup margarine or butter. Mix in 3/4 cup crushed corn flakes, 1/2 cup chopped nuts, 1/2 cup brown sugar.
Sprinkle topping evenly over potatoes & continue baking 10 minutes.
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