Marble cake, think of how easy this cake is to make

Marble cake, think of how easy this cake is to make
Ingredients:
125 g of butter
225 g of sugar
3 eggs
1 small glass of milk (200 ml)
250 g of flour
1 teaspoon of baking powder
1 tablespoon cocoa powder

Preparation method
Preheat the oven to 180°C.
Mix the creamy butter with the sugar until it forms a homogeneous cream.
Add the yolks (reserve the whites) and beat well.
Add the milk and continue beating until well incorporated.
Gradually add the flour and yeast, mixing until you get a smooth dough.
In another bowl, beat the egg whites until they form firm peaks.

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