Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius).

Combine butter, sugar, flour, and vanilla sugar. Mix until a crumb-like consistency forms. Set aside one cup of crumbs. Add remaining ingredients for batter into the bowl and mix to form a batter.

Mix all the filling ingredients together.

Sprinkle 1/3 of the reserved crumbs into bottom of a 12-capacity well-greased muffin tin. (Line with muffin papers if desired.) Divide the cake mixture in half. Spoon half the batter into the muffin tins, followed by the cheese mixture, then the remaining batter, and finally the reserved crumbs. Bake for 35 minutes.