Traditionalists argue it is that absence of the everyday which helps emphasize the meaning of the holiday. Broader thinkers point out that the explosion of kosher for Passover cake mixes and brownie mixes (none of which are very good) have already reduced the number of everyday treats off-limits during the holiday.
Thank goodness for the flourless chocolate cake. This taste treat came to prominence in the late 1990's. Consisting of semi-sweet (or bittersweet) chocolate, eggs and butter, this dessert will satisfy the pickiest of chocoholics. My go to recipe is from Bon Appetite, January 1999, which is easily found on Epicurious.com.
This recipe includes a chocolate glaze frosting. To me this is overkill. I prefer the cake just dusted with confectioner's sugar and a garnish of strawberries. Enjoy.