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Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round cake pan or springform pan, or line with parchment paper.

In a large bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt. Set aside.

In a separate medium bowl, whisk together the large eggs, whole milk, melted and cooled unsalted butter, vanilla extract, lemon zest, and orange zest until well combined.

Pour the wet ingredients into the dry ingredients and mix with a whisk or spatula until just combined. Be careful not to overmix; a few lumps are okay.

Add the very thinly sliced Granny Smith apples and lemon juice to the batter. Gently fold them in until all the apple slices are coated with the batter. The batter will seem very thin and the apples will be abundant; this is normal for invisible apple cake.

Pour the apple mixture into the prepared cake pan, spreading it evenly. The pan will be quite full.

Bake for 45 to 55 minutes, or until a toothpick inserted into the center comes out clean and the top is golden brown. If the top browns too quickly, you can loosely tent it with aluminum foil.

Remove the cake from the oven and let it cool in the pan on a wire rack for at least 15-20 minutes before attempting to unmold. This cake is quite delicate when warm.

Once cooled, carefully unmold the cake. Dust with powdered sugar, if desired, before slicing and serving.


Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round cake pan or springform pan, or line with parchment paper.

In a large bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt. Set aside.

In a separate medium bowl, whisk together the large eggs, whole milk, melted and cooled unsalted butter, vanilla extract, lemon zest, and orange zest until well combined.

Pour the wet ingredients into the dry ingredients and mix with a whisk or spatula until just combined. Be careful not to overmix; a few lumps are okay.

Add the very thinly sliced Granny Smith apples and lemon juice to the batter. Gently fold them in until all the apple slices are coated with the batter. The batter will seem very thin and the apples will be abundant; this is normal for invisible apple cake.

Pour the apple mixture into the prepared cake pan, spreading it evenly. The pan will be quite full.

Bake for 45 to 55 minutes, or until a toothpick inserted into the center comes out clean and the top is golden brown. If the top browns too quickly, you can loosely tent it with aluminum foil.

Remove the cake from the oven and let it cool in the pan on a wire rack for at least 15-20 minutes before attempting to unmold. This cake is quite delicate when warm.

Once cooled, carefully unmold the cake. Dust with powdered sugar, if desired, before slicing and serving.
