01 - Preheat oven to 225°F and line a baking sheet with parchment paper.
02 - In a clean, grease-free mixing bowl, beat egg whites with cream of tartar until soft peaks develop.
03 - Gradually add superfine sugar, spoonful by spoonful, beating until stiff, glossy peaks form and mixture is smooth. Continue by beating in cornstarch and vanilla extract.
04 - Pipe or spoon 8 mounds of meringue onto the prepared baking sheet, shaping each into a tall ghost-like figure with a swirling tip.
05 - Decorate each meringue with mini chocolate chips or pipe black edible gel to create ghost eyes and mouths.
06 - Bake for 1 hour and 15 minutes, until the exterior is dry and meringues lift easily from paper. Turn off oven, crack door, and allow meringues to cool completely inside.
07 - Whip cold cream with powdered sugar and vanilla extract until soft peaks form.
08 - Just before serving, gently top each ghostly meringue with a dollop of whipped cream and spoonfuls of fresh berries.