1 large (or 2 small) tart apples-peeled and chopped
For the cake:
4 Tablespoons butter
1/2 cup granulated sugar
1 large egg
1 teaspoon vanilla
1/2 cup sour cream
1 cup flour
1/4 teaspoon baking soda
1/4 teaspoon salt
1/2 teaspoon baking powder
Preheat the oven to 350 F. Grease 8 inch springform pan and line the bottom with parchment paper, set aside.
To make cinnamon streusel crumb in a bowl, whisk together dry ingredient, add melted butter and vanilla and stir until the mixture is evenly moist, set aside.
To make the cake in a large bowl, cream together 4 tbsp butter with 1/2 cup sugar until light and fluffy, add egg and beat well, then add vanilla and sour cream and beat again.
In another bowl, stir together 1 cup flour, baking soda, salt, and baking powder and add to the butter mixture, stir until just combined.
Spread half the batter at the bottom of the pan ( it will be very thin layer). Spread the apple chunks evenly over the batter, then sprinkle about 1 cup of the cinnamon streusel crumbs over the apples. Spread the remaining batter over the crumbs and on top spread the rest of the cinnamon streusel.
Bake 35-40 minutes or until a tester inserted in the center comes out clean.
Before remove the ring of springform pan run a thin knife around the cake.
To make the glaze whisk together powdered sugar with apple cider and drizzle over the cake.