400 g (14 oz) sweetened condensed milk 60 g (2 ⅛ oz or ~8 tbsp.) cocoa powder 2 eggs 120 g (4 ¼ oz or 1 cup) all-purpose flour 100 g (3 ½ oz or ½ cup) sugar 85 g (3 oz) unsalted butter 5 g (1 tsp.) salt 100 g (3 ½ oz) milk chocolate or chocolate chips (optional)
Preheat the oven to 180 °C (350 °F). In a saucepan over low heat, melt the butter. Sift together the flour and cocoa, add the salt and sugar. Stir with a whisk.
Add the eggs, condensed milk and melted butter to the dry ingredients. Knead the dough until smooth and uniform.
Pour the batter into the mold, sprinkle chopped chocolate on top and stir it into the batter. Bake in preheated oven for 20-25 minutes depending on desired texture. Cool and cut into squares to serve.