I used this recipe from Sally's Baking Addiction. She also gives plenty of tips and tricks on making meringues!
All you need are 4 egg whites, sugar, vanilla, cornstarch, and cream of tarter (which can be substituted with lemon juice or vinegar).
Whip it up in a mixer and bake it!
Isn't this beautiful?!
And very satisfying! : )
To make the correct size I traced a 9" baking pan on a piece of parchment paper as a guide.
It bakes for 90 minutes and then you shut the oven off and let it rest in there for several hours to cool. Resist the urge to touch it. You can see (on the top right) where I tapped it a little too hard and it cracked. It's ok though, cracks are common and it will all be covered with whip cream anyway!