Delicious Vanilla Cake

In a saucepan, combine one egg and 40 grams of granulated sugar. Whisk the ingredients until the sugar granules are completely dissolved. Then add the starch and mix well.

Pour the milk into the egg mixture and place the saucepan over medium heat. Stirring constantly, bring the mixture to a thick consistency, then let it cool.

In a separate deep bowl, combine the eggs with vanilla sugar and regular sugar. Beat the ingredients with an electric mixer until a pale, fluffy mixture forms.

Pour the vegetable oil and sour cream into the pale mixture and whisk to combine. Combine the baking powder with the flour, and sift it in batches into the egg mixture. Mix with a mixer to make a sponge cake batter.

Line the bottom of a baking pan (30x20 cm) with parchment paper. Pour the batter onto the bottom and spread it evenly across the surface.

Spoon the prepared custard over the top of the batter, creating a second smooth layer.

Preheat the oven to 170°C and bake the cake for 40-45 minutes.