Quick Sponge Roll

Separate the egg whites from the yolks.

Whip part of the sugar with the whites, and the rest with the yolks.

Combine both mixtures, sift in the flour, and gently fold with a spatula.

Line a preheated baking sheet with parchment paper, grease with vegetable oil, spread half of the batter, and smooth it out.

Bake in a well-preheated oven at 180 °C (350 °F) for 15 minutes until lightly golden.

Transfer the hot sponge cake with the paper onto a towel, roll it up, let it cool, then unroll and peel off the paper.

Spread with jam, optionally add a layer of sour cream whipped with powdered sugar, and roll it back up.