A soft and fluffy lemon flavored cake with a cheerful lemon curd filling and a light and airy whipped cream frosting.For best results, I recommend read through the tips in my post and watch my how-to video before beginning.
In a large bowl using an electric mixer or in a stand mixer, beat together oil, butter, sugar, reserved lemon zest, and vanilla extract until completely combined.
Stirring by hand, gradually alternate adding the flour mixture and lemon/milk mixture to the butter mixture, stirring until just combined after each addition (I start and end with the flour and add the flour mixture in 4 parts and the milk mixture in 3 parts).
Place egg whites in a separate clean, dry bowl, and beat on high speed with an electric mixer until stiff peaks form (see video or photo in post for a visual if needed).
6 large egg whites room temperature preferred
Using a spatula, gently fold egg whites into cake batter until completely combined (don’t use your electric mixer at this point or you will over-beat the batter). Divide cake batter evenly into prepared pans and bake on 350F for 28-31 minutes or until toothpick inserted in the center comes out clean or with a few moist crumbs.
Allow cakes to cool in pans for 10 minutes then run a knife around the edges to loosen cakes from pan and carefully invert onto cooling rack to cool completely.
Once cakes have cooled completely, prepare frosting.
ICING
Combine cream cheese, ½ cup (62g) powdered sugar, vanilla extract, and salt in a large bowl and use an electric mixer to beat together until creamy and smooth.
In a separate bowl, combine remaining ½ cup (62g) powdered sugar, and heavy cream. Beat with an electric mixer until stiff peaks form (mixture should be thick, billowy, and the same consistency as Cool Whip).
¾ cups(175ml) heavy cream
With mixer on low speed, stir together the cream cheese and whipped cream until completely combined.
Pipe a dam/border along the inside rim of one cooled layer of cake (see photo in post). Fill with lemon curd and spread evenly inside the dam.
¾ cup(175ml) lemon curd ³
Top with second layer of cake. Frost the entire cake with remaining frosting.
Keep cake refrigerated in an airtight container when not eating. Enjoy!
Video
Notes
¹Be sure to avoid the pith, or white papery layer just above the lemon flesh, when zesting. The pith is bitter and will make your cake bitter.²You may substitute all-purpose flour, you will need 2 ⅔ cup/330g of all purpose flour.³Store-bought lemon curd will work, but I recommend making my homemade lemon curd. You would only need a half-batch for this recipe, BUT a whole batch uses 6 egg yolks. Since you need 6 egg whites for this cake, I recommend making a full batch and enjoying the second half on whatever you’d like!⁴This recipe makes enough for a semi-naked cake covering. If you want to fully cover the cake or pipe designs decoratively on top of the cake as shown in the photos, I recommend increasing the recipe by 50% or even doubling.