01 -
Preheat oven to 175°C. Grease a 23x23 cm baking dish.
02 -
In a large bowl, whisk granulated sugar and melted butter for 1 minute until mixture is light and airy.
03 -
Add eggs one at a time, mixing thoroughly after each addition. Blend in vanilla extract.
04 -
In a separate bowl, sift cake flour, baking powder, and salt.
05 -
Gradually add dry ingredients to wet mixture, stirring until just incorporated.
06 -
Gently fold in sour cream until batter is smooth and homogeneous.
07 -
Pour batter evenly into prepared baking dish. Sprinkle surface with 25 grams granulated sugar.
08 -
Bake for 30 to 35 minutes, or until a toothpick inserted in the centre emerges clean.
09 -
Let cake cool slightly before slicing and serving.