Place a 4-inch parchment paper strip around the edge of a 9x3-inch cake pan that is already lined with parchment at the bottom. If you are using a spring form pan, make sure to wrap the bottom and sides completely in foil twice, to prevent any leakage.
Place the filled pan into a jelly roll pan or a large serving dish lined with 2 paper towels at the bottom. The paper towels ensure that the heat is distributed evenly along the bottom of the pan.
Fill the jelly roll pan about 1-inch with hot water.
Bake for 1 hour, until the cake has risen to almost double its height.
Remove from oven, and carefully, invert the cake onto your dominant hand and peel off the paper. The cake will be hot so be extremely careful, . You can also invert the cake onto a plate, but this will cause the cake to deflate more. Sprinkle the top of the cake with powdered sugar and serve.