Chocolate Magic Custard Cake

Directions

1. 1
   Separate egg whites and yolks. Mix and combine flour and cocoa powder.
2. 2
   Whisk egg yolks and sugar for 4 minutes until creamy and pale yellow.
3. 3
   Add melted butter and vanilla extract and mix for half a minute.
4. 4
   Add the flour and unsweetened cocoa powder. Mix with a spatula until incorporated well.
5. 5
   Pour the milk gradually and continue beating.
6. 6
   Beat egg whites in a bowl until stiff and add one third at a time to the cake batter, gently stir with a spatula after each addition. Don't overmix, just stir a few times.
7. 7
   Pour the liquid batter into the 30x17cm baking pan lined with parchment paper and bake for 40-50 minutes.
8. 8
   Let it cool and when it comes to room temperature chill in a refrigerator for an hour. Slice it in the size you like and dust with powdered sugar right before serving.