Parchment paper is a BIG one. It saves you on clean up.
Baking several batches of cookies for a bake sale? Parchment paper is a MUST!
Take 2 cookie sheets and line them with parchment paper. Cook them. Remove them from the oven and slide them with the parchment
paper onto the counter to let them cool. Line the same cookie sheets with parchment paper again and repeat. Except this time when you
go to put more onto bake the first batch will be cool so you can put them onto a plate and re-use the parchment paper from them to
cook this batch.
The beauty of parchment paper is:
1) You don't need to oil the cookie sheet if you're cooking something sticky- saving time, money, and calories!
2) It's re-usable until it literally gets all brown and crumbly
3) (my favorite) You don't need to wash the cookie sheets or pans-just throw away the parchment paper and put the cookie sheet or pan away.
4) It is relatively inexpensive- get it at restaurant supply for about $36 for 1,000 double sheets-translates to 2,000 cookies sheet size pans.