you will need:

 
100 grams of dark chocolate/
50g butter/
2 eggs/
4 tablespoons of sugar/
Pinch of salt/
½ cup self-rising flour/
For the filling: 3-4 cubes of dark chocolate

preparation:

Preheat oven to 180 degrees in advance ( It is important that it will be hot )
Melt the chocolate and butter cube in the microwave and stir until you receive a smooth chocolate mixture
Add the sugar and a pinch of salt and mix, leter on add the flour and stir, then add the 2 eggs and mix again.
Grease a cup / template, and pour the mixture too about two-thirds. Bury one square of chocolate in each mixture.
Bake for 10 to 12 minutes.
***Serve immediately
(I will recommend to serve it alongside vanilla ice cream, whipped cream or / and cherries / strawberries)