Waxed Cloth Food Wrap (Made in a solar oven for bonus self-righteousness points)
...you don’t want to use so much that the coating becomes thick and flaky. I used about 1 tablespoon of wax pellets for cloths about 11 inches square, just to give you an idea. Place the cookie sheet in an oven set between 150F/64C and 185F/85C for about 10 minutes, just until the wax melts. Safety note: Keep the oven low–don’t be tempted to use a hot oven for speed, because the wax could discolor at higher temperatures, or even burst into flame if...