Preheat oven to 400 degrees.
After potatoes have been peeled and cubed, place them in a saucepan and cover with water. Cover and bring to a boil. Cook for 20-25 minutes or until very tender. Drain well.
Warm the milk in another sauce pan on low. Be care not to let the milk boil.
After potatoes have been drained, mash them very well. Then add the warm milk, butter, salt and pepper. Continue to mash until desired consistency.
Add the garlic powder, parmesan cheese, egg, and 3/4 cup of the mozzarella cheese. Mix this all together. Then place in a greased baking dish. Top with bread crumbs and the remaining mozzarella cheese. Bake in the oven for 20 minutes or until golden brown on top. Enjoy!
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