Directions Prep: 20 min › Prepare: 45 min › Ready in: 1 hr 5 min
Preheat your oven to 180 levels C. Grease a 20cm cake pan and line the underside with parchment paper.
Inside a mixing bowl, beat the butter and sugar together, adding the eggs, individually, mixing well after each addition. Fold within the flour, milk, and vanilla and blend until you receive a smooth batter.
Pour out half the batter into another bowl. Stir the cacao powder into one bowl.
Spoon the chocolate and white-colored cake batter in to the pan alternately until all of the batter is completed. Utilizing a knife, swirl with the batter a couple of occasions to produce a marbled effect.
Bake for 45-55 mins, or until a skewer placed in to the center arrives clean. Come out onto a cooling rack and then leave to awesome.