Prepare the Batter: In a blender, beat together the milk, oil, eggs, sugar, and chocolate powder until the mixture is smooth and well combined.
Combine Dry Ingredients: Transfer the blended mixture to a bowl. Mix in the flour and baking powder using a hand mixer until fully incorporated.
Prepare the Pan: Grease a 22cm diameter loaf pan with margarine and coat it with wheat flour to prevent sticking.
Bake the Cake: Pour the batter into the prepared loaf pan. Bake in a preheated oven at 180°C (350°F) for about 35 minutes or until the cake is baked through and has a golden color.
Cool and Unmold: Once baked, allow the cake to cool in the pan for a few minutes before transferring it onto a wire rack to cool completely.
Make the Filling: In a saucepan over medium heat, combine the condensed milk, butter, chocolate powder, and chopped milk chocolate. Stir continuously until smooth and let it cool slightly, then mix in the cream.
Prepare the Topping: Melt the white chocolate along with the butter in a separate pan. Add cream and gently mix until well combined.
Assemble the Cake: After the cake has cooled, use a knife to cut a hole in the center, filling it generously with the chocolate filling. Cover the entire cake with the melted white chocolate mixture and decorate with black beads.
Serve: Slice the cake to reveal the molten center and enjoy this delightful eruption of flavors!