Preheat the oven to 350 ° F. Grease the 8-inch spring dish and cover it with parchment paper, set aside.
To make cinnamon breadcrumbs, start by whipping the dry ingredients in a bowl. Then add the melted butter and vanilla and mix until the mixture is uniformly moist. Book also.
To make this cake in a large bowl, cream together 4 tbsp. Butter with 1/2 cup sugar until light and fluffy, then add egg and beat well. Finally, add vanilla and sour cream and whip again.
In another bowl, mix 1 cup flour, baking soda, salt and baking powder and add to the butter mixture until everything is well mixed. Spread half of the dough in the bottom of the pan (it will be a very thin layer).
Spread the apple pieces evenly over the dough, then sprinkle about 1 cup cinnamon streusel crumb on the apples. Spread the rest of the dough on the crumbs and distribute the remaining streusel with cinnamon.
Bake for 35 to 40 minutes or until a tester inserted in the center comes out clean.
Before removing the ring from the hinged mold, place a thin knife around the cake.
To make the glaze, mix the powdered sugar with the apple cider and pour over the cake.