Stir condensed milk, chocolate and brown sugar over low heat to melt chocolate. Set aside to cool slightly. Whisk together eggs, vanilla, salt and yogurt. While whisking, add this mixture to the chocolate mix. Fold in all other ingredients and bake in a slow oven (it will take a while!). Once cooked, turn off oven and allow to cool completely in the oven to avoid a crater in the middle. To be proper flash, dust with icing sugar and top with fresh berries.