Place eggs, sugar, flour, milk, vanilla, emulsifier in a mixing bowl. Whisk with high speed until reaching a thick and fluffy consistency.

Add butter & oil to the batter. Do not over mix.

Take a small portion of batter and combine with the prepared chocolate paste.

Pour batter into a baking pan then add randomly chocolate butter on top. Make a random pattern with a toothpick or any kind of thin stick.

Bake (pre-heat oven at 180 degC) for about 45-50 minutes. ENJOY!