Prep ahead of time: Make the apple butter ahead of time and divide out 80g / ⅓ cup for the batter and 300g / 1 cup (for the filling).

Prepare: Preheat your oven to fan-forced 160°C/320°F or conventional 180°C/356°F. Line the base and sides of a 9 or 10-inch (23-25cm) with parchment paper.

Make the crumb topping: Add the flour, sugar, cinnamon, and butter to a medium bowl. Rub the butter into the dry ingredients until it resembles a crumb consistency. Set aside in the fridge.

Mix dry ingredients: Sift the flour, baking powder, baking soda, and sea salt into a bowl and stir to combine. Set aside.

Cream the butter and sugar: In a large bowl with a handheld or stand mixer, beat the butter and sugar until creamy, about 3 minutes.

Combine the wet ingredients: Add the yogurt, 80g (⅓ cup) of apple butter, and vanilla extract and mix until combined.

Make the batter: Alternate between adding the apple cider and dry ingredients to the wet ingredients in 3 increments, folding to combine each time. Do not overmix the batter.

Assemble: Add half of the cake batter to the baking pan. Carefully add 300g (1 cup) of apple butter on top and use an offset spatula to smooth it in an even layer, being gentle not to press it down into the batter. Top with the remaining cake batter, smoothing out the top.

Topping: Sprinkle the cubed apple pieces on top, followed by an even layer of crumb topping.

Bake: Bake in the preheated oven for 60-70 minutes. To check for doneness, insert a skewer or toothpick into the center, it should come out almost clean with a few crumbs. If there is still wet batter (not apple filling) on the skewer, continue to bake for another 5 minutes if and as needed.

Cool: Allow the cake to cool in the tin for 15 minutes and then carefully remove the pan and transfer to a wire rack to cool further. Wait for the cakes to cool completely before adding the glaze.

Make the glaze: In a medium bowl, whisk together the powdered sugar, apple cider, and vanilla extract until smooth. Cover and set aside until ready to use. Once the cake is completely cool, drizzle the glaze all over the top.