Steps
1. Break the chocolate croissant into small pieces and set aside.
2. Crush the Oreo cookies into small crumbs.
3. In a bowl, mix the milk and sugar until the sugar dissolves.
4. Melt the white chocolate and dark chocolate separately using a microwave-safe bowl by placing it in sunlight or a warm area for a few minutes, stirring occasionally (alternatively, grate finely).
5. Combine melted white chocolate with milk mixture.
6. In a small serving glass or bowl, layer half of the croissant pieces.
7. Pour half of the milk and white chocolate mixture over the croissants.
8. Sprinkle half of the Oreo crumbs on top.
9. Repeat the layering with remaining croissant pieces, milk mixture, and Oreo crumbs.
10. Drizzle grated dark chocolate on top as decoration.
11. Refrigerate for at least 1 hour to allow flavors to meld and the cake to set.
12. Serve chilled.