marbled cocoa and vanilla cake with creamy heart from @_pasqualecannata

In a jug, combine the milk, yogurt, and vinegar, mix and let sit for 15 minutes. Add the eggs, oil, sugar, and salt, mixing until smooth and uniform. Transfer to a large bowl and add all the dry ingredients except the cocoa, sifting them, incorporate the chocolate chips and mix until uniform. Divide into two, add cocoa to one half, and alternate spoonfuls of each mixture using two spoons or an ice cream scoop. Draw with a toothpick, add hazelnut protein cream, repeat the drawing, and bake in a preheated oven at 180°c for about 35-40 minutes. Let cool before serving and enjoy the creamy center.