Grandmother's Cinnamon-Sugar Kuchen (Dairy)

Preheat oven to 375 F/190 C. Grease and flour a large tube pan. In a small bowl, combine cinnamon and sugar. Place the melted butter in another small bowl. Set aside.

In a large bowl, whisk together the cake flour (or all-purpose flour and cornstarch), and baking powder. Rub the butter into the flour until the mixture resembles breadcrumbs. Add the sugar and stir to combine.

Make a well in the center of the mixture. Put the eggs, milk and sour cream into the well. With a wooden spoon, slowly begin mixing the wet ingredients into the dry ingredients until the mixture is combined. (The batter will be very thick).

Spread half the batter into the bottom of the prepared pan. Drizzle evenly with half of the melted butter. Then, sprinkle half of the cinnamon and sugar mixture on top of that.

Spread the rest of the batter on top of the cinnamon and sugar. Drizzle with the remaining melted butter, followed by the rest of the cinnamon and sugar mixture.

Bake for 50 minutes to an hour, or until a tester inserted into the center comes out clean. Be careful not to overcook as this makes the cake dry.