In a bowl placed over a saucepan of simmering water melt the chocolate and butter. Remove from heat and let it cool completely (otherwise your brownies will turn out hard and dry!).
Preheat oven to 170°C. Line a pan with parchment paper. In a bowl cream together the eggs, sugar and vanilla extract. Mix in the melted chocolate mixture.
In another bowl whisk together the flour, baking soda and salt and slowly add to the chocolate-egg mixture with a wooden spoon.
Pour into the prepared pan and bake for about 20 minutes. Remove from oven and let cool completely.
For the filling: Mix together Mascarpone, yoghurt, cottage cheese, sugar and vanilla extract. Beat the heavy cream until stiff and add to the filling.
With a cookie cutter cut out any shapes you like of the brownie. Then put some filling on your piece of brownie and place another piece on top. Add more filling and decorate with strawberries.