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In a large mixing bowl, place the 3 whole eggs and 1 egg white. Add 1 tsp of sweetener (such as Stevia). Using an electric mixer, beat the eggs and sweetener together on high speed for at least 5-7 minutes, or until the mixture becomes light, fluffy, and significantly increased in volume. This step is crucial for creating a soft and airy sponge cake without using flour.
Once the eggs are well-beaten, gently mix in 4 tbsp of powdered milk. Do this at the lowest speed of the mixer, or fold it in manually using a spatula to ensure the eggs don’t deflate.
Line the bottom and sides of a baking tin with parchment paper, or use a silicone baking tin to avoid sticking. Pour the sponge batter into the prepared tin and smooth out the top.
Bake the sponge cake in the preheated oven for 20-25 minutes, or until a toothpick inserted into the center comes out clean. Once done, turn off the oven and let the sponge rest inside for an additional 5 minutes before removing it to cool.
2. Prepare the Filling
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