Marble Cake

• 7 tablespoons butter room temperature
• 3/4 cup sugar
• 2 large eggs yolks and whites separated
• 6 tablespoons milk
• 1 5/8 cups flour
• 1 tablespoon baking powder
• 1 pinch salt
• 1/2 teaspoon vanilla extract
• 2 tablespoons cocoa powder

1. Preheat the oven to 180 degrees Celsius.
2. Line a 20 x 20 centimeter cake pan with parchment paper.
3. Beat the butter until light and fluffy. Mix in the sugar.
4. Beat in the egg yolks and milk until combined.
5. Sift in the flour and baking powder. Mix until just absorbed.
6. Separately, in a bowl whisk the egg whites with a pinch of salt until stiff peaks form. Carefully fold them into the first mixture.
7. Divide the batter in 2. In 1 half, add the vanilla. In the other half, add the cocoa powder.
8. Pour the 2 batters into the cake pan alternating batters. With a knife, insert the tip into the batter and swirl it around between the 2 batters.
9. Bake 20 minutes until a toothpick inserted in the center comes out clean.

butter, sugar, eggs yolks, milk, flour, baking powder, salt, vanilla, cocoa powder

Taken from www.yummly.com/recipe/Marble-Cake-626923 (may not work)