Separate egg whites from yolks and add to a medium sized bowl. Let them sit out on counter to come up to room temperature for 30-60 minutes.
Heat oven to 250° and cover un-greased cookie sheets with parchment paper.
Beat egg whites with a hand mixerr on medium to high until stiff, moist peaks form. Slowly beat in sugar just a 1/4 cup at a time then fold in vanilla. Continue to beat mixture a few more minutes, ensure that it reamins glossy and does not become grainy.
Fill a pasty bag with mixture and add a medium sized round tip (or just cut the edge off of the tip of a large freezer bag). Pipe medium to large circular, ghost shaped, mounds onto cookie sheets about 2 inches apart. Bake 30-35 minutes.
Dip a toothpick into some black icing / frosting and add eyes, mouth, and any other 'scary' features to your ghosts!