Whip the soft butter with sugar and vanilla, then add the cream and mix.
Beat whites until stable.
Mix flour with baking powder and mix with butter. Then add the squirrels and mix gently so that they do not settle.
Put about 1/3 of the cooked dough into a separate bowl and add melted chocolate to it.
Grease a baking dish with butter and sprinkle with flour. Pour half the white dough into the mold, flatten and pour the chocolate dough. After again a layer of white dough, make a drawing with a knife or a wooden stick, as if mixing from top to bottom, only not very intense otherwise you will not get a marble pattern.
Bake in a preheated oven to 180 degrees for about 30-45 minutes, check readiness with a toothpick.
The airy marble cake is not only very tender and delicious, but also beautiful and spectacular. To make such a pie is not too difficult as it might seem at first glance. If desired, you can decorate the cake to your taste, for example, cover with chocolate icing or just sprinkle with powdered sugar. To make a pie, use sugar to your liking.