Parchment paper is often used when baking various cupcakes, pies, buns and other dough products. The goal is to reduce the risk of them sticking to the surface of the sheet. Many recipes say that the parchment should be greased with butter or oil, margarine. The choice of fat base depends on the type of baking.
It seems to be a common action when they talk about the need for lubrication, but at the same time, it is possible not to do it. There are a few cases where this can be avoided.
Not every type of dough needs an oil layer on the parchment. For example, if there will be a pastry made of shortcrust pastry. It already has enough fat, so this is quite enough.
In addition, to avoid additional application of butter or oil, you should use parchment with a silicone coating. This is quite enough so that nothing sticks to the surface.