This low carb sponge cake is light, moist, and made with almond flour for a soft, tender crumb. It is a simple base recipe that works beautifully for layered cakes, celebration desserts, or your favorite frosting and fillings.
Preheat oven to 350°Fahrenheit (180°Celsius), line a springform pan, separate the eggs, and measure the remaining ingredients.
Beat the egg whites with cream of tartar until glossy peaks form. Beat the yolks with sweetener, stir in vanilla and almond flour.
Fold the egg whites into the yolk mixture until just combined.
Pour into the prepared pan, bake for 35 minutes, then cool completely before removing from the pan.
Notes
The egg white bowl must be completely grease-free before the whites go in. Even a small trace of fat on the bowl or beaters will prevent the whites from reaching medium-stiff peaks regardless of how long you beat them.
Room-temperature egg whites beat faster and reach a higher volume than cold ones. Take the eggs out of the fridge 20 to 30 minutes before you start for the fullest possible lift from the beaten whites.
To split the cooled sponge into two even layers, use a long serrated knife with a gentle sawing motion around the perimeter first, before cutting through the center. A row of toothpicks pressed in at the same height around the equator of the cake gives you a level guide to follow.
If the sponge sticks at the edges despite the parchment paper, run a thin knife between the parchment and the springform sides before releasing the latch. The parchment on the base always releases cleanly but the sides occasionally need a gentle pass first.