Use the double boiler method to melt dark chocolate and butter. Heat water in a pan, place a bowl on top (ensuring the bottom doesn't touch the water), add dark chocolate and butter, and stir slowly until melted.
2
Let the melted chocolate cool slightly, then add condensed milk and vanilla extract, and mix well until completely combined.
3
Sift together flour, cocoa powder, baking powder, baking soda, and salt to remove any lumps and keep the batter smooth.
4
Using the cut and fold method, gently mix the dry ingredients into the wet mixture. Lift batter from the sides with a spatula and fold into the center, continuing slowly until you achieve a thick ribbon-like consistency.
5
Transfer the batter into a cake pan, tap lightly to level the surface and remove air bubbles. Bake in a preheated oven at 160°C for 25 minutes.
6
After baking, allow the brownies to cool completely in the pan to set the perfect texture. Once cooled, cut into pieces and serve.