Preheat the oven to 300 degrees F (150 degrees C). Line a baking sheet with parchment paper.

Beat egg whites in a large bowl with an electric mixer until stiff, but not dry. Gradually beat in sugar until a little of the mixture between your thumb and forefinger feels smooth, not gritty. Stir in vanilla.

Pipe or spoon small portions onto the prepared baking sheet.

Bake in the preheated oven until dry but not brown, about 35 minutes. Turn the oven off and leave meringues inside to cool for at least 25 minutes.