Heat your oven to 275°F (135°C) and line a baking tray with parchment paper.
Use a clean bowl to beat the egg whites with an electric mixer. Beat until soft peaks form, which means the egg whites hold shape but the tips flop over.
Slowly add the powdered sugar, a little at a time, while beating constantly. Keep mixing until the meringue becomes thick, shiny, and holds stiff peaks. Add vanilla extract if you like and mix briefly.
Spoon dollops of the meringue onto the baking tray. Shape each into a small circle and gently make a shallow well in the center to hold the fruit later.
Bake the meringue for 45-50 minutes. When done, they should feel dry and firm. Turn off the oven and leave the meringues inside to cool slowly. This helps prevent cracking.
While the meringues cool, prepare the fruit. Gently mix the strawberries, raspberries, and blueberries in a bowl.
Warm the red currant jelly in a small pan or microwave until it melts. Brush it lightly over the fruit for a shiny finish and extra sweetness.
Fill each cooled meringue nest with the fruit mixture. Drizzle some jelly on top for sparkle.
Serve your Summer Fruit Meringue Nests right away to enjoy the crisp texture and fresh flavors.