Preheat your oven to 200° C (400° F), line a baking sheet with parchment paper.
For my location, I found frozen puff pastry in blocks that need to be rolled, I have not located folded sheets yet. Thaw the pastry according to package instructions. Place the block on a floured surface and lightly flour the top and flour your rolling pin as well. This is the thawed size from the package. The tile is 12x12 inches for reference.
Rolled thin, roughly to about 9x12 inches. Use a pizza cutter and cut the pastry into about ¾ inch strips, and I was able to cut this into 12 strips. The first piece at the far end was already used on a horn before I took this photo.
About ½ inch from the pointy end of the mold, wrap a strip of pastry and continue wrapping, overlapping towards the wide end of the mold, press the end that is near the wide end and place on the prepared baking sheet with that seam on the bottom. Repeat until all strips are used. I looked at a lot of cream horn on the internet and it seemed that 5 wraps was the number to have so I went with that.
Place in the oven and bake for 18 minutes, but keep an eye on them as all ovens heat differently. When they are a light golden brown, they are done, These were perfect at exactly 18 minutes. If not baked properly, they can uncurl if under baked, and stick to the molds if overbaked, and no one likes that.
Right after the come out of the oven, you need to remove the horns from the molds. Easily done, just hold a mold by the wide end with an oven mitt, and gently push the horn off hold, they will slip right off. Allow the horns to cool completely before filling. Allowing them too cool on the mold may result in horns sticking.