Line a medium-sized round bowl (around 1.5 liters) with plastic wrap. Let the edges hang over so you can lift the dome out easily later.

In a large mixing bowl, combine desiccated coconut, powdered sugar, and a pinch of salt. Add the softened butter, milk, and vanilla extract. Use a wooden spoon or your hands to mix until the texture becomes a soft, moldable dough.

Press about two-thirds of the coconut mixture firmly into the bowl, creating a thick layer that lines the entire inside.

Spoon the chocolate spread into the cavity, smoothing it out evenly. Leave about an inch from the top.

Use the remaining coconut mixture to cover the chocolate layer. Press gently but firmly to form a complete dome.

Cover the top with the excess plastic wrap and refrigerate for at least 4 hours—or overnight—until completely firm.

Gently lift the dome out using the plastic wrap and invert it onto a serving plate. Remove the wrap and sprinkle generously with desiccated coconut.

Slice into wedges and serve.