Place egg whites, salt and cream of tartar in a large bowl and whip it on medium speed for 7-8 minutes or until stiff peaks form. Then, add sugar in ¼ cup at a time and continue whipping for a total of 2-3 more minutes until the sugar is incorporated. Last, add the cornstarch (or all purpose flour--either one works!).
Use a spoon to scoop dollops of the meringue onto a LINED baking sheet (if you don't line it, they will stick to the baking sheet--found that out the hard way), making sure to place them 2-3 inches apart. Then, use the back of your spoon to make an indent into the center of each meringue.
Bake meringue for 1 hour; then, turn the oven off but leave baking sheet in the oven for an additional hour, allowing the meringue to cool.
Before serving, prepare the whipped cream: whip the whipped cream until soft peaks form, then add the sugar and whip for 1-2 more minutes.
To serve: scoop whipped cream into the center of each pavlova, then add whatever toppings you like! Examples include seasonal fruit, caramel and/or chocolate.
Enjoy!
Notes
*Don't add the whipped cream until right before you're going to eat/serve these. Otherwise, they'll get too soft in the center.