*What You Need To Know About Creating Nicely Domed Madeleines
The secret to the bosse is partly the temperature differential achieved by placing chilled batter in a very hot oven. I suppose in a way it’s the opposite of baking an ordinary cake, which can unfortunately bolt upward in the center—normally because of the oven being too hot—whereas here that’s part of the plan. The batter needs an hour or so to rest in the fridge. I like to make it the night beforehand.