Cut the chocolate and the caramel toffee in small bites. Put a few bites on the side, to save as topping.
Preheat the oven at 175 degrees Celsius.
Add the egg, baking soda, salt, vanilla sugar, salt, and oatmeal mix together.
dd the chocolate and soft caramel toffee and stir together.
Place a baking paper in a oven form with removable edges.
Spread evenly in the oven form
Place in the middle of the oven for 35 minutes.
Take out, spread the rest of the chocolate and caramel bites in the mud cake and let it cool down in room temperature.