Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.

In a mixing bowl, beat the eggs and sugar until frothy and pale (about 5 minutes).

In another bowl, whisk together the flour and baking powder.

Gently fold the dry ingredients into the egg mixture along with vanilla extract.

Pour the batter onto the prepared baking sheet and bake for 12-15 minutes until golden brown.

While cooling, whip the heavy cream until soft peaks form, then fold in the mixed berries.

Once cooled, flip the cake onto a powdered sugar-dusted towel, spread the berry cream mixture over it, and roll tightly.

Chill for at least an hour before slicing and serving.