Step 1:
In a large mixing bowl, combine the sugar and egg yolks. Whisk until smooth.
Step 2:
Add the baking powder and cornstarch. Whisk again until well blended.
Step 3:
Add the Greek yogurt and continue whisking until the mixture is smooth and well combined.
Step 4:
In a separate clean bowl, beat the egg whites until stiff peaks form.
Step 5:
Gently fold the whipped egg whites into the batter using a spatula.
Step 6:
Add the chocolate chips and fold them in carefully.
Step 7:
Pour the batter into an 8-inch (20 cm) cake pan lined with parchment paper.
Bake at 170°C / 350°F for 1 hour.
Step 8:
Once baked, allow the cake to cool slightly, then dust with powdered sugar.
Step 9:
Slice, serve, and enjoy the fluffiest yogurt cake ever!