Preheat oven to 350 degrees Fahrenheit.
Combine all-purpose flour and baking powder in a mixing bowl. Mix well and set aside.
In a separate bowl, combine egg yolks and vanilla extract. Whisk (using an electric mixer) while gradually adding 5 ½ tablespoons of granulated white sugar. Set aside.
In another bowl, beat the egg whites while gradually adding the remaining 8 tablespoons of granulated white sugar until soft peaks form.
Fold-in the egg yolk mixture with the egg white mixture. Gradually sprinkle the flour and baking powder mixture while folding.
Grease a flat baking tray, and then pour-in the mixture. Spread the mixture evenly.
Put inside the oven and bake for 13 to 16 minutes.
Remove from the oven and allow to cool down.
Sprinkle confectioners sugar on the top part and distribute evenly.
Remove the cake from the tray and place in a parchment paper or cloth (the part with confectioners sugar should be facing down).
Spread Jelly over the cake (the side opposite the one coated with sugar).
Roll the cake gently starting from one of the edges.
Trim both ends of the rolled cake. Transfer to a serving plate.
Serve. Share and enjoy!