Mash potatoes well with mixer. Blend together the next 6 ingredients; mix together well. Might be slightly runny and/or lumpy.
Pour into 8x11 dish. (It bakes GREAT in a stone casserole dish if you have one).
Spread on TOPPING.
Bake uncovered at 350 degrees for 35 minutes. Check it to make sure the topping doesn't burn.