Made this tonight and since I'm on a ketogenic (low carb/no suger) diet I had to make several adjustments. For the chocolate I substituted Hershey's sugar free morsels. Instead of regular sugar I used 1/4 cup of Monk Fruit. I didn't need more "sugar" as the morsels have sugar alcohols. I did add a few tablespoons of heavy cream and coconut flour for texture. It turned out great! Rich and delicious. Next time I'll add some espresso freeze dried granules and cinnamon. Just tweeks really.

Outstanding. This is our family go-to celebration cake. It is straightforward, unfussy, elegant. Use great quality belgian dark chocolate (callenbault) and wait for the applause. Truly, this cake never fails to impress—it is light yet luscious, intense yet delicate. Perfect.

I have made this cake several times & will be making it again next weekend! It's easy and always turns out fabulous! I always use fresh eggs, butter and the best chocolate I can find. One time, I was short on chocolate and found some old raspberry flavored chocolate chips in the pantry, so I threw them in.... the cake was still great & had that hint of raspberry flavor.

Very yummy! Just followed this because I was craving a treat which is not easy on Passover! Easy to make. I didn't have enough chocolate so I subbed 4 TBS baking cocoa powder and it turned out. Also used non-dairy margarine and it did not impact the final product. This would probably be tasty with coconut oil instead of butter and coconut shavings. My only comment is that if you want this to be kosher for Passover, use kosher for Passover powdered sugar. Regular powdered sugar has cornstarch which is not kosher for Passover. Kosher for Passover powdered sugar uses potato starch. Honestly, this has a lot of protein and not that much sugar. Probably healthier than a Clif bar!!!

I love this cake! Thanks for the tip on the longer baking time. It was perfection. Does anyone have experience/advice on how to apply this recipe for a much larger cake? Party coming up with 40 + guests!

Amazing cake! Light- almost like a souffle. Easy to make. The high protein, no flour, low sugar will make this cake my new goto easy dessert.

I really goofed and left half the chocolate on the counter. But the cake worked great without it. It rose perfectly and had a light airy texture and I did not miss the extra chocolate. In fact I think that might have made it too dense and rich. I love my augmented recipe.

I just forgot to say that I didn't have a springform pan (hope Martha isn't listening) so I made it in the only available dish: an 8 inch square pyrex casserole type dish... And it still turned out just the way Martha Stewart said it would...So don't be leery of trying it, okay?

I made this first ever flourless cake, for a friend with Celiac's. She loved it! So did I! I used Ghiradelli Bittersweet chocolate, which gave the cake a deep dark chocolate flavor. The cake is scrumptious in texture (soft angelfood-cake texture inside, crispy outside) and easy-peasy to make. Mmmmm-Yum!

In the event you choose to make this cake, despite my previous warning (ha!) -- two things: (1) you do not need to line your springform pan if it's a no-stick one. (2) Baking temp was not too low for my electric oven - followed instructions exactly, and it did cook thoroughly. I was just very disappointed in the taste. I would look into adding cocoa powder -with adjustments to accommodate the addition.