Preheat the Oven: Preheat your oven to 225°F (110°C) and line a baking sheet with parchment paper.
Whip the Egg Whites: In a large mixing bowl, beat the egg whites with a hand mixer on medium speed until foamy. Gradually add the granulated sugar, one tablespoon at a time, beating on high speed until stiff peaks form. This process may take about 7-10 minutes.
Add Flavors: Gently fold in the vanilla extract being careful not to deflate the meringue.
Pipe the Meringue: Use a piping bag fitted with a star nozzle to pipe circular nests onto the prepared baking sheet, creating a well in the center of each.
Bake: Bake in the preheated oven for about 1.5 hours, or until the meringues are dry and crisp. Turn off the oven and let them cool inside for another hour.
Whip the Cream: In a separate bowl, whip the heavy cream with powdered sugar and vanilla extract until soft peaks form.
Assemble: Once the meringue shells are cool, fill each shell with whipped cream and top with fresh berries. Serve immediately!