Pre heat your oven to 180 fan forced (350 Fahrenheit) and line a baking sheet with baking paper
If needed, warm the chocolate spread in the microwave for 15 seconds (to make spreading easier)
Take the pastry from the freezer and mark it at the top and bottom sides into thirds (I use a 24cm square of pastry, so I mark it at 8cm and 16cm).
Using a sharp knife or pizza cutter, cut the pastry into 3 rectangles (you can use a ruler if you want perfectly straight lines)
Now cut each rectangle into 2 triangles, giving you 6 triangles in total
Spread an even layer of chocolate spread onto the pastry, avoiding the very top and bottom of the pastry, to make it easier to roll
Take the wider end of each triangle and roll it up, ending at the point, to create a croissant. Place onto lined baking tray and repeat with the remaining triangles
Lightly whisk your egg with a fork, then generously brush each croissant with the beaten egg.
Bake for 18 minutes, until golden brown. Serve fresh from the oven