Preheat the oven to 350β/180β. For easy removal of the cake, place parchment paper on the bottom and 2 sides of the pan. Gently grease the two sides without parchment paper and then set aside. Cut the apples, about 2 cups total.
In a medium sized bowl, add in flour, cornstarch, cinnamon, nutmeg, baking powder, baking soda, and salt. Stir to combine and set aside.
2 cups all-purpose flour
In a large bowl, add softened butter and white sugar. Beat on medium speed for 2-3 minutes until itβs light and fluffy. Make sure to scrap the sides of the bowl.
1/2 cup butter, 1 cup white sugar, 1/2 tsp cinnamon, 1/8 tsp nutmeg, 1 tbsp cornstarch, 2 tsp baking powder, 1/4 tsp baking soda, 1 tsp salt
Add in the egg, egg yolk, vanilla, and applesauce. Continue mixing on medium speed until smooth.
1 egg room temperature, 1 egg yolk, 1 tbsp vanilla, 2/3 cups unsweetened applesauce
Mix in the dry ingredients and using a spatula, gently fold until a batter forms. Do not overmix!
Slice the apples into small cubes and add into the bowl. Gently mix until JUST combined, don't over-mix!
2 cups apples
Spread the batter into the prepared pan evenly. In a small cup, add white sugar and cinnamon and mix together. Then sprinkle on top evenly. This will give you a sweet crunchy top.
2 tbsp white sugar, 1/4 tsp cinnamon
Bake for 35-45 minutes, depending on your oven. It took me 45 minutes. Allow it to cool, slice, and enjoy!