Drain boiled potatoes, place in bowl, add all the casserole ingredients to the potatoes,then mash all ingredients together that way the flavors blend together beautifully. Place in a lightly greased 13 inch x 9 inch pan. Make sure the mixture is kind of even.
Mix together the topping mixture, pour onto of the casserole evenly. Bake at 300 for 35 mins. Top should be a golden brown color, Don't over cook.