Step 1

Preheat the oven to 350 F. Grease 8 inch springform pan and line the bottom with parchment paper, set aside.

Step 2

To make cinnamon streusel crumb, first  in a bowl, whisk together dry ingredient. Then add melted butter and vanilla and stir until the mixture is evenly moist, set aside, too.

Step 3

To make the 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 beat again.

Step 4

In another bowl, stir together 1 cup flour, baking soda, salt, and baking powder and add to the butter mixture, stir until just combined.

Step 5

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.

Step 6

Bake 35-40 minutes or until a tester inserted in the center comes out clean.

Step 7

Before remove the ring of springform pan run a thin knife around the cake.

Step 8

To make the glaze, whisk together powdered sugar with apple cider and drizzle over the cake.