There are two ways to prevent the sourdough discard focaccia to prevent from sticking to the baking pan:   1.     First, rub butter all around the pan surface. Then drizzle and spread olive oil before putting in the dough. 2.     The second method is to use parchment paper. Crush the parchment paper and then open it.  In doing so the parchment paper fits easily in all shapes of the pan, without folding over. After putting the parchment paper in the pan, grease it with some olive oil. Now when you will put the dough in it, there will be no issue of dough sticking.