350 g all-purpose flour

Pinch of fine salt

1 tsp vanilla sugar (or 1¼ tsp granulated sugar + ¼ tsp vanilla extract)

1 tsp baking powder

100 g unsalted butter, finely grated and chilled

1 large egg, separated (yolk and white)

4 Tbsp granulated sugar (approximately 50 g)

100 g sour cream

Zest of ½ lemon

300 g fresh cheese (cream cheese or quark), room temperature

3 Tbsp powdered sugar (approximately 25 g)

1 tsp vanilla sugar (or 1¼ tsp granulated sugar + ¼ tsp vanilla extract)

1 large egg, separated

30 g cornstarch (or potato starch)

Zest of ½ lemon

Milk, for thinning the egg wash

Powdered sugar, for dusting after baking