Preheat the oven to 350F. Then grease a 9x13 baking dish with a piece of butter.

Place room temperature butter and both white and brown sugar in a large bowl. Combine with a spatula first (so the sugar doesn’t spray out), and then use an electric mixer to cream your mixture until light and fluffy.

Add one egg at a time and use a whisk to mix after each addition. Next, add vanilla extract and combine.

In a different bowl, mix flour, baking powder, and salt. Then, add ⅓ of the flour mixture into the egg mixture bowl. Stir to combine and add ¼ cup of milk and combine. Follow with ⅓ of flour, stir, and then another ¼ cup of milk. Finish by combining the remaining flour. Set it aside.

Prepare the apple crumble by mixing all the crumble ingredients until well combined.

Pour half of the cake batter into the prepared baking pan, followed by ½ of the apple crumble. Then, add the remaining batter and the crumble on top.

Bake the cake for 50 to 55 minutes or until an inserted toothpick, comes out clean.

Let it cool to room temperature before taking it out of the pan. For the size of the cake, it’s easier to slice it first and then transfer it one piece at a time.

Enjoy!