Pre-heat the oven to 350F and line a square brownie pan with parchment paper. I used a 9 by 9 pan.
In a mixing bowl, whisk egg with sugar. Then, pour melted butter, melted chocolate and give it a whisk.
In a separate bowl, mix flour, salt and baking powder.
Add the dry ingredients to the egg mixture and mix them until it comes to form a smooth batter.
Pour the batter to the pan and top it with raspberries. Bake it for about 25 to 30 minutes until the top of the brownie is dry, shows mild crackle and the center is set.
Cool completely at room temperature before you slice it.