Crafting the Dough
In a spacious mixing bowl, combine flour, baking powder, and powdered sugar. Mix them well before adding the grated cold butter. Incorporate the butter into the mixture until it resembles coarse crumbs.
Kneading and Chilling
Now, add the egg yolks to the mixture and knead until you achieve a smooth dough. Divide the dough into three equal portions, placing one portion in the refrigerator to chill.
Preparing the Pan
Line a 20cm baking pan with parchment paper and evenly spread the remaining dough over it. Set it aside as we move on to crafting the luscious filling.
Crafting the Cake Filling
Whisking the Filling
In a separate mixing bowl, combine sour cream, yogurt, sugar, and starch. Whisk vigorously until all ingredients are well incorporated and no lumps remain.
Perfecting the Egg Whites
In another bowl, beat the egg whites with a pinch of salt until foamy. Gradually add sugar while beating until stiff peaks form. This ensures our cake achieves a light and airy texture.
Combining the Mixtures
Carefully fold the yogurt mixture into the beaten egg whites until fully combined. This creates a velvety batter that promises a delightful cake experience.
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