I use so much of it that I purchase it in ten and twenty pound stacks of some 500 sheets from a commercial bakery supply house. Most parchment paper is kosher. You should be able to get five and six uses from one sheet - providing you are buying a good quality paper. Cut parchment paper in circles and line tube and spring-form pans for sticky honey and chocolate cakes. DO NOT substitute wax paper or greased brown paper for baking parchment.
Parchment gives many baked good a more professional look.
For instance, rich treats, Tollhouse cookies , come out with high rolled edges. The parchment controls the spread of the high fat dough.