greese proof paper i would assume grease a baking tray, cut out some greased proff paper and put in greased tin then grease that, sounds like someone is baking.
Baking parchment is a non-stick paper used to line tins or trays t prevent cake or bsicuit mixtures from sticking to the tin. Unlike greaseproof paper, baking parchment does not need to be greased before using.
Greaseproof is normally white and if you are microwaving the bars or making crisps they stick to it. Baking paper is brown and nothing sticks to it both come in a roll like cooking foil.
My baking parchment came from Tesco, but I did notice the other day they sell a re-usable "Magic" liner, heatproof and non-stick to line your plates (or what ever) with. Anyone tried it?