I had a lucky accident when revisiting my old gateau moelleux recipe recently. I left out the butter! I was very scared of the result, but it turned out to be a deliciously moist sponge cake! And now that I've researched the American equivalent for one "sachet de levure chimique," you Americans will have more success with this now! (Other cooking conversions at: http://www.beyond.fr/food/convert.html. An English-French dictionary of food terms is also linked to that page.)
10 tablespoons sugar
10 tablespoons flour (plus about an extra two for dusting pan)
10 tablespoons milk
a little over 2 teaspoons of baking powder (or one sachet of levure chimique)
half cup of orange juice (I prefer flash-pasteurized, no pulp)
Preheat oven to 356 degrees F (180 degrees C). Prepare a square or round cake pan by greasing interior with a little butter and dusting with about a couple tablespoons of flour (bottom and sides). In a medium-sized mixing bowl, beat eggs with an electric mixer. Add sugar, mix. Start boiling milk in pan on stove. Once you see the milk begin to boil, toss flour and baking powder into bowl. Mix quickly. Milk will be frothing very high in the pan. Add milk to ingredients, mix quickly. Pour into cake pan and bake for 30 minutes. Remove from oven and pour orange juice slowly and evenly over top. Cool to room temperature (or refrigerate) before serving.
[Note: Basis of recipe found at http://www.linternaute.com/femmes/cuisine/recette/305946/1089259993/gateau_moelleux_pommes_poires.shtml.shtml]