Starting in one top corner, use your finger to lightly trace out five lines horizontally across the pastry to create six triangles. The end ones may be a bit wonky, but that's alright. Once you are happy that the triangles are pretty even, use a sharp knife or pizza cutter to cut through the lines to create six long triangles. See photos in the blog post for assistance.
Divide the cooled béchamel between each croissant, spreading it out on the wider part of each triangle, leaving the very top of the short side, and the final third or so of the long point empty. See the blog post photos for assistance.
See blog post for more details.
Store in a sealed container for up to three days. Re-warm in a toaster oven or regular oven set at 325F until warmed through, about 8 minutes.
You can freeze baked cooled croissants in a freezer bag up to one month. Thaw in the fridge overnight and re-warm as described above. See blog post for freezing unbaked croissants.
Feel free to prepare the croissants up to the point of the egg wash and store in the fridge overnight. Bring out while the oven is heating up the next morning. Brush with egg and continue with the recipe.
Feel free to halve the recipe if so desired.