Whisk egg yolks with sugar until double in size and looks creamy.
Using a spatula, fold in lemon zest, Greek yogurt, and add corn starch.
Whip the egg whites until stiff peaks. Then, carefully fold it into your preparation.
Pour over your preparation into the Flexipan®.
Bake for 30 minutes at 350F/180C. (Every oven heats differently, monitor your cake from 20min)
Once your cake is out of the oven, let it completely cool down before unmolding. Then, Serve and Enjoy! (I tend to keep mine in the refrigerator, as I like to have it for breakfast).