Preheat the oven to 350 degrees Fahrenheit.

In a medium-size bowl, place flour, sugar, vanilla sugar, baking powder, salt , oil, vinegar, water, and chocolate sauce. Mix with a spoon and set aside.

In another small bowl, place cream cheese, egg, and sugar and mix with a spoon and set aside.

In a third bowl, place sugar, flour, vanilla sugar and melted margarine and mix with a spoon and set aside.

Place tarts on a baking sheet. Fill tarts by placing chocolate batter three-fourths full, then add one teaspoon of cheese batter. Using a knife, lift a small amount of chocolate batter from the bottom to the top to make a marbled effect than sprinkle crumbs. Bake on 350 degrees Fahrenheit for 30 minutes. Drizzle with chocolate sauce.