A delicate and creamy Apple Cake with whipped cream frosting, sponge cake layers, and candied apple filling! It's perfect for any fall occasion, or just because!
Start with the sponge cake. Preheat the oven to 350°F. Line the bottom of two, 8-inch cake pans with parchment paper, leaving the sides ungreased.
Place the eggs, sugar, and vanilla into a stand mixer bowl. Whisk on high speed for 7 to 10 minutes, until the eggs are very fluffy and almost white in color. If you don’t have a stand mixer, this step will take a little longer.
In a separate bowl, combine the all-purpose flour, almond flour, and baking powder. Sift the dry ingredients into the egg mixture in thirds, folding very gently but thoroughly using a spatula. Fold from the bottom of the bowl to ensure all the flour is incorporated.
Divide the batter between the two pans; use a kitchen scale for accuracy. Bake the cake layers on the middle rack at 350°F/177°C for 22 to 24 minutes, until the tops of the cakes are golden brown.
Remove the cakes from the oven and while the layers are still hot, carefully run a knife along the edges to release the cake from the pan. Gently invert onto a wire rack, remove the parchment paper, and allow the cake layers to cool completely.
Making Candied Apple Filling:
Next, prepare the apple filling. Peel and finely diced the apples, then place them into a saucepan or deep sauté pan. Add the water and sugar and stir.
Cover and cook the apples over medium heat, bringing them to a simmer. Cook covered for about 7 to 8 minutes, then remove the lid and continue to cook until the apples are tender, translucent and syrupy. Total cooking time is approximately 18 to 22 minutes, depending on the apple variety.
If all the water evaporates from the pan but the apples are not yet tender, add more water and continue to cook.
Set aside this filling and allow it to cool completely. It can also be done ahead of time.
Making the Frosting:
Prepare the frosting once the cake layers and filling have cooled. Place the softened cream cheese into a medium bowl, then use a mixer to beat the cheese for a few minutes, until it’s creamy and smooth.
Next, add in the vanilla, sour cream, and sweetened condensed milk. If you want a sweeter frosting, add the optional powdered sugar. Beat again for a few minutes, until the mixture is thick and creamy. Set this aside.
Pour the chilled heavy cream into a separate bowl and whisk until it reaches stiff peaks, about 5 to 6 minutes using a stand mixer. Start out at a slow speed and gradually increase the speed as the cream thickens.
Add the cream cheese mixture to the whipped cream and whisk for a minute or two, just until the frosting is thick and fluffy.
Keep this frosting well-chilled. If the frosting becomes too soft or runny, place the entire bowl into the refrigerator for 30 minutes to 1 hour, then whisk again.
Assembling the Cake:
Before assembling the cake, first use a long, serrated knife to split the sponge cake layers in half, creating 4 layers total. I recommend using the bottom half of the layers for the bottom and top of the cake.
Use a pastry brush to lightly soak each cake layer with heavy cream.
To assemble the cake, add a generous amount of whipped cream frosting onto each cake layer, followed by a quarter of the apple filling. You’ll use ¼ of the filling between each layer and the remaining ¼ for topping the cake. Stack the layers evenly and gently.
Frost the outside of the cake with a crumb-coat layer of frosting, sealing the edges. Refrigerate the cake and your bowl of frosting for 20 minutes.
Once chilled, apply a thick layer of frosting all over the cake, smoothing it with an off-set spatula or cake spatula.
If desired, melt a handful of chocolate melts into the microwave. Transfer the chocolate into a small plastic bag, cut off a tiny tip off the corner, and drizzle over the top of the cake.
Transfer the remaining frosting into a pastry bag tipped with a star tip; I used Ateco #847. Pipe dollops of frosting onto the cake, then garnish with the remaining candied apple filling.
I recommend refrigerating the cake for at least 4 hours or overnight for the best results.