Heat oven to 180C/160C fan/gas 4. Slice into each croissant lengthways, but don’t go all the way through - they should open like books. Sprinkle or spread the bottom half of each with marzipan, followed by 1 tsp almonds and 1 tbsp chocolate.
Close up, put on a baking sheet and sprinkle the remaining chocolate and almonds on top. Bake for 5 mins or until the chocolate has melted. Serve warm.