Preheat the oven to 160°C / 340°F. Line a 20 cm springform pan with parchment paper, then wrap the outside with foil to prevent water from seeping in when you place it in the water bath.
In 2 different mixing bowls, separate the egg whites from the yolks.
Now, mix the egg yolks with condensed milk, lemon juice and, zest and Greek yogurt until combined. Set aside.
Whisk the egg whites in the second bowl with a stand mixer or electric whisk until stiff peaks form (I use a stand mixer).
Now, gradually fold the egg whites into the yolk mixture with a spatula until incorporated (Make sure there are no lumps in your batter).
Pour the cake batter into the prepared baking pan and then put the baking pan in a larger pan then fill the outer pan with water so the water is 3cm high.
Bake in the preheated oven for 45 minutes, then turn off the heat and let the cake cool COMPLETELY, then put in the fridge for 2-3 hours or overnight.
Sprinkle powdered sugar on top (optional), then cut and serve.
Notes
To store: Cover leftovers or place them in an airtight container and store in the fridge for up to 4 days.