01 -
Heat the oven to 325°F. Grease an 8-inch springform pan, line the bottom with parchment, dust lightly with cornstarch, and wrap the outside of the pan with foil.
02 -
In a large bowl, whisk the egg yolks and sugar for 1-2 minutes until lighter in color. Whisk in the Greek yogurt, cornstarch, vanilla bean seeds, lemon zest, and salt until smooth.
03 -
In a clean bowl, beat the egg whites with lemon juice until soft, glossy peaks form. The whites should hold their shape but still look moist.
04 -
Stir one large spoonful of egg whites into the yogurt mixture to loosen it. Gently fold in the remaining whites in two additions, stopping when no large streaks remain.
05 -
Pour the batter into the prepared pan. Set the pan in a roasting pan and add hot water halfway up the sides. Bake for 50-55 minutes, until puffed, lightly golden, and softly jiggly in the center.
06 -
Turn off the oven, crack the door, and leave the cake inside for 20 minutes. Remove from the water bath and cool to room temperature.
07 -
Refrigerate the cake for at least 2 hours before unmolding. Dust with powdered sugar and serve with berries if desired.