Beat the vanilla essence and eggs together in a bowl for about 5 mintues. Slowly add the sugar to the mixture. Beat the mixture for about 20-30 minutes or until fluffy.
Seive the all-purpose flour and baking powder together. Mix the flour mixture in the eggs mixture and beat again until there are no lumps in the mixture.
In a swiss tray, spread the egg & flour mixture for about 1 inch height. Pre-heat oven to 400 degrees F and bake for about 8-10 minutes.
In a baking tray, spread butter paper, grease it with a non-stick cooking spray and sprinkle the powdered sugar. Now turn the cake tray over the butter paper sprinkled with powdered sugar. Cut the top portion of the cake and the sides of the cake neatly with a knife. Then spread the jam over the top of the cake, roll the cake carefully like a mat and let it cool down for a while. Then cut it into 12 pieces and serve.