Line a 9 inch springform pan with parchment paper and set aside. Preheat the oven to 350 degrees F.
In a separate medium bowl, combine diced apples, brown sugar, cinnamon, and cornstarch. Toss together and aside. 2 Honeycrisp Apples1/4 cup Brown Sugar2 tsp Cinnamon1 tbsp Cornstarch
In a small bowl, mix together brown sugar, flour, cinnamon, and melted butter. It should form a crumbly/paste like texture - this will be the crunch topping. Set aside. 1/4 cup Brown Sugar2 tbsp All Purpose Flour 1 tbsp Cinnamon1 1/2 tbsp Salted Butter
In a large mixing bowl, whisk together brown sugar, sugar, and oil for about 1-2 minutes, until smooth and combined, then add in the eggs, vanilla extract, and sour cream. Continue to whisk together until smooth, about 1 minute. 1 cup Brown Sugar1/4 cup Sugar2/3 cup Vegetable Oil 3 large Eggs2 tsp Vanilla Extract1 1/4 cup Sour Cream
In a separate bowl, whisk together all purpose flour, baking powder, cinnamon, nutmeg, allspice, and kosher salt. Add dry ingredients to the wet ingredients and mix together until just combined, about smooth. 2 1/2 cups All Purpose Flour 2 1/2 tsp Baking Powder2 tsp Cinnamon1/2 tsp Nutmeg1/2 tsp Allspice1 tsp Kosher Salt
Add half of the apple mixture to the batter and fold together with a rubber spatula. Pour the cake batter into the prepared pan, then add the remaining apples on top. Sprinkle the crumble on top and bake for 1 hour and 15-25 minutes, until a toothpick inserted into the center of the cake comes out clean.
While the cake is baking, make the glaze. Whisk together confectioners' sugar, milk, vanilla extract, melted butter, and cinnamon. 2 cups Confectioners' Sugar 2-3 tbsp Whole Milk2 tsp Vanilla Bean Paste 2 tbsp Salted Butter1/2 tsp Cinnamon
Allow the cake to cool in the pan for 15 minutes, then remove onto a wire rack. Pour glaze over the warm cake and allow it to cool for 25-30 minutes before slicing so that crispy sugar glaze has time to set.
Notes
Use the right apples: tart apples like Granny Smith and sweet apples like Honeycrisp apples or galas apple gives the best flavor.
Don’t overmix the batter: Stir just until combined so the cake stays tender and not tough.
Glaze while warm: Drizzle the sweet glaze over the cake while it’s slightly warm so it seeps into the cracks, just like a glazed fried apple fritter.
Rest before slicing: Let it cool at least 25 minutes before cutting so the layers can set.
Check doneness early! Every oven runs differently, start checking with a toothpick 5–10 minutes before the timer goes off. Insert into the center of the cake and if it comes out clean or with just a few crumbs, it's done!