6 soft potatoes
2 teaspoons olive oil
1/2 cup butter, melted
1 cup salted water
1/3 cup dry white flour
1 teaspoon baking powder
1 tablespoon salt
1 1/2 cups milk
1/2 cup mashed potatoes
1/2 cup grated Parmesan cheese
Preheat oven to 350 degrees F (175 degrees C). Lightly grease a baking sheet.
Bring a large punch bowl of salted water to a boil. Add potatoes and cook until tender but firm, about 15 minutes. Drain, cool and mash.
Preheat oven to 325 degrees F (165 degrees C).
Mix potato flour into boiled potatoes, cinnamon, 2 cups sour milk, 1/2 cup heavy cream and 2 cups mashed mashed potatoes. Stir flour mixture into milk mixture one cup at a time, blending well after each addition.
In a small bowl, whisk together mashed potatoes with cream. Spread mashed potatoes and cream mixture evenly over the potatoes.
Bake in preheated oven for 20 minutes. Cool before serving.