In a large mixing bowl, whisk together the eggs and sugar until well combined.

In a saucepan, heat the milk over medium heat until warm, then gradually add the corn starch, stirring constantly to avoid lumps.

Slowly pour the egg mixture into the milk, continuing to stir until it thickens to a custard-like consistency.

Remove from heat and add the cocoa powder, stirring until fully incorporated.

Crush the cookies into small pieces and distribute them evenly into serving bowls or glasses.

Pour the chocolate custard over the cookies, filling the bowls or glasses.

Melt the dark chocolate with the cream in a microwave or over a double boiler, then drizzle over the top of the desserts.

Allow to cool slightly before serving.