Drawing inspiration from the iconic Matilda cake, this moist chocolate cake recipe is so fudgy, so chocolatey, and so incredibly rich. It makes one large cake with tons of glossy chocolate fudge frosting! With that said, this will definitely be your new go-to chocolate cake recipe.
What makes this the best chocolate cake recipe?
With so many chocolate cake recipes all over the internet, why make this one?
Inspired by the iconic and ultra fudgy Matilda cake, I was incredibly picky with how I wanted this cake to turn out. It had to be so incredibly soft and moist that you wanted nothing more than to dig straight into the cake and eat it out of your hand.
And for the first time in my life, I’m proud to say that I tested this theory and I now only want to eat cake using this technique from here on out.
With how soft and fudgy and jiggly (yes this cake is so moist it JIGGLES when you nudge it), I just could not resist.
Plus, it took quite a bit of trial and error to get just the right ratios of fat to chocolate to flour to sugar and throughout my testing, I found that these were the most essential ingredients to achieving an incredibly moist chocolate cake:
- Mayonnaise – Listed in many old fashioned recipes (and the famous Portillo’s chocolate cake), mayonnaise is used to create tons of richness in chocolate cake. It’s essentially just a mix of eggs, oil, and vinegar so it adds loads of protein and fat to the recipe. And don’t worry, you can’t taste it one bit!
- Cornstarch – The first test I did with this recipe was with all cake flour because I wanted a really delicate cake, but I found it actually made the cake a bit TOO soft. So I then tried all purpose flour which didn’t make the cake soft enough. The fix – I replaced some of the all purpose flour with cornstarch and it made the perfect texture. The cake is tender and spongey without being too soft and crumbly.
- Vinegar – With a secret ingredient list of mayo, cornstarch, and vinegar I really don’t see how any wouldn’t want to try this cake! But trust me, all three work in harmony to create an incredibly delicious chocolate cake. And taking notes from ultra moist red velvet cake, a tablespoon of vinegar is added to further that soft texture. Vinegar slows the gluten formation to create a very tender cake.
Tips for baking moist chocolate cake
To ensure your cake turns out as fudgy and moist as possible, here are my top chocolate cake baking tips:
- Flour – I say this in every post, and for good reason. It’s the number one reason why most recipes fail. If there’s too much flour, this cake will turn dry. If possible, measure the flour with a food scale. Otherwise, to ensure the exact amount, gently spoon the flour into the measuring cup and level it off with a flat edge. If scooped directly into the flour container, the flour becomes packed down into the cup which could leave you with 1/4 cup or more of added flour. The same goes for the cornstarch and cocoa powder!
- Cocoa powder – Speaking of, this recipe calls for regular unsweetened cocoa powder. Refrain from using dutch process as this can throw off the acidity of the cake and it may not rise properly. But if you prefer a richer color, I suggest swapping just 10-15 grams of the regular cocoa powder with dutch process. This will provide a deeper color without disrupting the batter.
- Dark brown sugar – This is used for a reason so if you can help it, I suggest sticking with it. The extra molasses in dark brown sugar adds an added layer of moisture to this cake.
- Hot coffee – When mixing in the coffee, make sure it’s hot or at least warm. This heat will activate the cocoa powder to bring out even more chocolate flavor.
- Mixing – When the dry ingredients are added to the batter, be cautious of how fast you’re mixing. Only just just enough to bring the batter together. Otherwise, an over worked batter can lead to a sunken cake.
- Cake strips – This is optional, but they do help produce incredibly even cakes. Cake strips are pieces of fabric that are moistened and wrapped around the cake pans before baking. They prevent the oven heat from hitting the outside of the cakes too fast, resulting in more well-done edges and a soft inside. With cake strips, these cakes bake perfectly even and moist from the inside out.
- Doneness – Pull the cakes when a toothpick in the center comes out clean with a few moist crumbs. The cakes should also appear slightly puffed in the center with somewhat bubbly surfaces.
How to make chocolate fudge frosting
What brings this entire cake together is the super glossy chocolate fudge frosting. Not only does it make this chocolate cake look absolutely mouth watering, but it adds another layer of chocolate that’s not too sweet and not too heavy.
First, butter is mixed until smooth and then powdered sugar, salt, vanilla, and corn syrup are mixed in. The corn syrup is used to keep the frosting glossy so don’t skip out on it!
Off to the side, warm water is mixed with cocoa powder. This is then poured into the butter mixture. It will cause the frosting to turn a bit thin but don’t be alarmed. This amount of liquid is intended to thin out the frosting as it helps create a very fudgy consistency.
Then an entire bag of chocolate chips is melted down and mixed in. The frosting will thicken slightly after the chocolate is added, but it will end with a soft pudding consistency.
To make this frosting sturdy and spreadable, chill it for about 45 minutes. Then give the frosting another good mix using a rubber spatula and test the consistency. If the frosting holds its shape in the bowl (like the picture in this post) then it’s ready. If it’s still too thin, chill until thickened.
Chocolate Cake FAQs
I tested this cake with all cake flour and, personally, I think it makes the cake a bit too delicate. I formulated this recipe to create the most perfect tender and spongy consistency without being too soft and this mix of all purpose flour and cornstarch does just that.
I actually have a gluten free chocolate cake recipe that’s also very moist and delicious!
I also have a vegan chocolate cake recipe that’s so rich and moist.
I haven’t tested this specific batter as cupcakes, but I do have a very moist chocolate cupcake recipe that I know yields delicious cupcakes.
I suggest sticking with dark brown as the extra molasses adds another layer of moisture to the cake. Light brown sugar can be used, but dark brown is definitely recommended.
I use dutch process cocoa powder in the frosting because I prefer the darker color (although regular unsweetened can be used). But for the cake batter, I suggest sticking with regular unsweetened as the batter was built around this level of acidity. Dutch process cocoa powder is alkalized so it may through off the baking process. If anything, I would swap about 10-15 grams of the regular unsweetened with the dutch process in order to create a richer chocolate cake color.
Yes, bake the cakes and then cool at room temp. Once completely cooled, wrap each layer in plastic wrap and store in the refrigerator. They’ll keep moist for a couple days.
Yes once the frosting is made, cover and chill. It can be stored in the refrigerator for about a week. Then, bring the frosting up to room temp and give it a good mix to smooth out before use.
Since the frosting is pretty soft at room temp, I suggest storing this cake in the refrigerator. It will keep moist for about 5 days. But for the best eating experience, serve at room temperature.
For more of the BEST cake recipes, check out my:
- Funfetti Cake
- Perfect Carrot Cake
- Sweet Almond Cake
- Fudge Brownie Cake
- Fudgy Vegan Chocolate Cake
- Gluten Free Chocolate Cake
Make sure to tag me @butternutbakery on Instagram and leave a review below if you make this chocolate cake. To pin this recipe and save it for later, you can use the button on the recipe card, the buttons above or below this post, or on any of the photos above. Happy baking!Print