Step 1

Preheat the oven to 350 degree F. Butter a 10-inch springform pan.

Step 2

To make the cake: in a large bowl, use an electric mixer to beat the butter, sugar, and vanilla seeds for a few minutes or until light and fluffy. Add the eggs, 1 at a time, incorporating each egg in before adding the next. Beat for 2 to 3 minutes or until creamy.

Step 3

In a medium bowl, whisk together the flour, baking powder, and salt. Add this to the butter-sugar mixture and mix with an electric mixer for 1 minute or until well combined. Scrape the batter into the butter springform pan and arrange the apples on top, pushing the apples slices gently into the batter.

Step 4

For the crumble, whisk together the flour, 2/3 cup sugar, vanilla seeds, and 2 teaspoons cinnamon in a large bowl. Add the melted butter and mix until crumbles form. Sprinkle the crumble over the fruit. Then in a small bowl, whisk together 2 teaspoons sugar and 1/8 teaspoon cinnamon, sprinkle over top of the crumble.

Step 5

Transfer to the oven and bake for 50-60 minutes or until golden on top. If you insert a skewer in the center, it should come out almost clean. Let the cake cool for at least 15 minutes before taking it out of the pan.