°2 cups large, peeled, diced Granny Smith apples (about 2 medium)
°1/3 cup granulated sugar
°1/2 tsp cinnamon
°2 tsp cornstarch
°2 tsp water
°1/2 c dark brown sugar
°1/2 tsp cinnamon
° 1/3 cup butter, room temperature
°3/4 cup granulated sugar
°1/2 cup apple juice
°1 teaspoon vanilla
°2 eggs
°2 1/4 cups flour
°1 teaspoon baking powder
°1 teaspoon baking soda
°1/2 teaspoon kosher salt
°1 teaspoon cinnamon
° 1 c Greek yogurt or sour cream
°2 c powdered sugar
°1/3 c milk
°1 tsp vanilla

* Methods :

In  saucepan, combine apples, granulated sugar, cinnamon, cornstarch, & water.
Heat over medium heat for 5-6 minutes, until apples are softened and liquid thickens. Set aside to cool.
Mixing dark brown sugar // cinnamon in  bowl and set apart.
Heat the oven to 350 degrees Fahrenheit. Grease a 9" x 13" pan with nonstick spray. Sit aside.
In the bowl of your stand mixer, fitted with the paddle attachment, mix the butter and sugar together for 3 minutes until the mixture is fluffy.
Add the apple sauce, vanilla, and eggs and mix over medium heat until combined, scraping the sides of the bowl as necessary.
In a separate bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.
Add dry mix and Greek yogurt in successive portions, starting with the dry mix and ending with it. Mix until combined.
Spread half of the cake mixture on the bottom of the prepared tray. Pour the apple mixture over it and spread it carefully to cover the mixture. Then add two-thirds of the brown sugar, and sprinkle over the apple mixture.
Cover with the remaining mixture and sprinkle one-third of the remaining brown sugar on top.
Bake for 35-40 minutes, or until the center of the cake is firm.
When the cake has only a few minutes left of baking, prepare the glaze by mixing the powdered sugar, milk, and vanilla in a medium bowl until smooth.
When cake is done, immediately poke holes in cake with butter knife, about 30 clicks.
Pour the glaze over the greased surface of the cake to cover it completely. Leave the mixture for 20 minutes before serving.

Enjoy !