Sift flour, baking powder, and salt together.
Beat eggs in large bowl with sturdy egg beater or at high speed of electric mixer.
Add sugar gradually and beat until mixture becomes fluffy, thick, and light-colored.
Gradually fold in flour; then vanilla.
Pour batter into 15 x 10 x l inch pan which has been greased on bottom and sides, then lined on bottom with paper and greased again.
Bake in hot oven (400°F.) 13 minutes.
Turn cake out onto cloth which has been sprinkled lightly with confectioners' sugar.
Quickly remove paper and trim off crisp edges of cake.
Then roll cake, rolling cloth up in cake, and place on rack to cool, about 30 minutes.
Unroll and remove cloth.
Spread with desired filling.
Roll up again, leaving end of cake underneath.
Sprinkle with additional confectioners' sugar or spread with a glaze.