No need to grease the parchment for profiteroles.

I agree. Silpat or parchment. Give it a go.

I use parchment paper. They never stick.

I have always used grease proof paper (parchment paper in the USA), but I grease it with butter. Never sticks, always perfect

I've never had that problem, but I've only used silpats, or a ridiculously inexpensive silicone baking mat I purchased at KMart.

Is "grease proof paper" the same as baking parchment paper? If not, try parchment paper.

Or try a silicone baking mat. Silpat is one well-known, but rather pricey, brand; there are others. More expensive than parchment, but reusable.