Preheat oven at 325°F.

Beat egg whites until stiff, turn bowl over and it shouldn't fall.

Add sugar and egg yolks.

Mix sifted flour, baking powder and salt and add to egg whites.

Add butter.

Mix on low.

Add vanilla.

Prepare pan.

Pour and bake for 20 minutes.

Place a damp cloth over pan and turn the pan over.

Roll up the bread while it is still warm.

Leave to settle.

Unroll, add filling and re-roll.