Wait… Mayonnaise in Cake? (Yes, Really!)
Okay, I know what you’re thinking—mayonnaise in a chocolate cake? Sounds kinda weird, right? I had the exact same reaction when I first heard about it. I mean, mayo is for sandwiches, not dessert! But trust me on this one. This cake is so rich, moist, and chocolatey that you’ll forget all about the mayo the second you take a bite. And no, you won’t taste it—pinky promise!
Fun fact: Chocolate Mayonnaise Cake dates back to the Great Depression when eggs and butter were hard to come by. People got creative, and mayo became the secret ingredient for a perfectly moist cake since it’s basically eggs and oil. Fast-forward to today, and this classic cake is still a crowd-pleaser.
Honestly, I wasn’t expecting much the first time I made it. But one bit in, and I was hooked. Now, it’s one of those desserts I whip up when I want something easy but insanely good. Plus, watching people’s faces when you tell them the “secret ingredient” after they’ve devoured their slice is always fun. Spoiler: it’s always shock followed by, “Wait… really?!”
So, grab your mixing bowl, some cocoa powder, and—yep—a jar of mayo. Let’s bake a cake that will have everyone asking for seconds.
Table of Contents
Why Mayonnaise Works in Chocolate Cake
So, why would anyone put mayonnaise in a chocolate cake? I get it—it sounds like a prank your grandma would pull. But stick with me because there’s some legit science behind it.
Mayonnaise Adds Moisture Like Nothing Else
Mayonnaise is made from eggs and oil, two ingredients bakers use to keep cakes moist. Moreover, the oil in mayo helps the cake stay soft for days—if it even lasts that long! I’ve made dry cakes by day two, but this one? It’s still smooth and fudgy by day four (not that it usually lasts that long in my house).
It Makes the Cake Rich Without Extra Butter
Not only does mayonnaise add moisture, but it also makes the cake taste richer. The eggs in mayo help bind everything together, while the oil gives it that velvety texture we all love in a good chocolate cake. In other words, you get all the goodness of a buttery cake without having to use a stick of butter. Win-win, right?
No, You Won’t Taste the Mayo—Promise!
This is probably the most asked question: “But will my cake taste like mayo?” Nope! The cocoa powder and sugar take care of that. Furthermore, the mayo just melts into the batter, leaving behind nothing but soft, chocolatey goodness. If I hadn’t made it myself, I wouldn’t believe mayo was in there either.
Ingredients You’ll Need for Chocolate Mayonnaise Cake

Alright, let’s talk ingredients. The best part? You probably have most of these sitting in your kitchen right now. Plus, this recipe doesn’t require anything fancy—just simple pantry staples and, of course, a jar of mayo.
Flour
All-purpose flour works best here. It gives the cake structure without making it too dense.
Cocoa Powder
Go for unsweetened cocoa powder for that deep chocolate flavor. Moreover, a good-quality cocoa powder makes all the difference, so splurge a little here if you can!
Sugar
Regular granulated sugar sweetens the cake perfectly. After all, what’s cake without sugar, right?
Mayonnaise
Full-fat mayonnaise is key. Honestly, I’ve tried using low-fat mayo, and while it’s okay, full-fat gives you that rich, moist texture that makes this cake unforgettable.
Vanilla Extract
A splash of vanilla adds warmth and enhances the chocolate flavor. (And yes, you should totally measure vanilla with your heart.)
Baking Soda and Salt
These two work behind the scenes to lift your cake and balance the sweetness. Moreover, never skip the salt—it’s the secret hero of any dessert.
Hot Water or Coffee
This is my favorite trick! Hot water works great, but hot coffee? It intensifies the chocolate flavor like magic. Plus, you don’t taste the coffee—just extra chocolatey goodness.
Step-by-Step Guide to Making Chocolate-Mayonnaise Cake
Alright, let’s get to the fun part—the baking! Don’t worry, this recipe is super straightforward, and I’ll walk you through every step. Plus, you don’t need to be a pro baker to pull this off (trust me, if I can do it, so can you).
Preheat Your Oven
First, preheat your oven to 350°F. Also, grease and flour your cake pans or line them with parchment paper for easy removal. (Nobody wants half their cake stuck to the pan, right?)
Mix Your Dry Ingredients

Whisk together the flour, cocoa powder, sugar, baking soda, and salt in a large bowl. Make sure everything’s well combined—nobody wants a mouthful of baking soda.
Add the Wet Ingredients
Next, stir in the mayonnaise, vanilla extract, and hot water (or coffee, if you’re feeling fancy). Don’t overmix—just stir until everything’s smooth and combined. (Seriously, overmixing is the easiest way to end up with a dense cake.)
Pour and Bake
Pour the batter evenly into your prepared cake pans. Then, bake for 30-35 minutes, or until a toothpick comes out clean. (And hey, don’t open the oven door too often—been there, done that, had a sunken cake.)
Cool and Frost
Finally, let the cakes cool completely before frosting. I know, waiting is the worst part, but trust me, it’s worth it. Moreover, a warm cake plus frosting equals a melty mess.
If you’re a fan of unique chocolate desserts, this Chocolate Mayonnaise Cake is a must-try! The mayonnaise keeps the cake incredibly moist, similar to how the tangy twist in Chocolate Sauerkraut Cake surprises your taste buds. For an even richer chocolate experience, pair this cake with a drizzle from the Triple Chocolate Brownie Recipe,
Frosting Ideas for Your Chocolate Mayonnaise Cake
So, your cake is baked, cooled, and ready for the final touch—frosting! Honestly, frosting is where you can really have fun. Whether you like it rich and chocolatey or light and creamy, there’s a frosting out there calling your name.
Classic Chocolate Buttercream

You can’t go wrong with chocolate buttercream. It’s smooth, rich, and doubles down on that chocolate flavor. Moreover, it’s easy to whip up with just butter, powdered sugar, cocoa powder, and a splash of milk. Bonus tip: Add a pinch of salt to balance the sweetness!
Cream Cheese Frosting
If you want something with a little tang, cream cheese frosting is the way to go. Not only does it add a nice contrast to the sweet cake, but it’s also super easy to make. Just beat cream cheese, butter, powdered sugar, and vanilla until smooth. (And try not to eat it straight from the bowl—I dare you.)
Chocolate Ganache
Feeling a little extra? Chocolate ganache is silky, glossy, and makes your cake look straight out of a bakery. Moreover, it’s just two ingredients—chocolate and heavy cream. Heat the cream, pour it over the chocolate, stir, and boom—fancy frosting with zero effort.
Tips for Storing and Serving Chocolate Mayonnaise Cake
Alright, so you’ve baked the perfect Chocolate Mayonnaise Cake and maybe even frosted it to perfection. Now, let’s talk about how to store it so every slice stays just as moist and delicious as the first.
How to Store Your Cake
- Room Temperature: Keep your cake in an airtight container at room temperature for up to 3 days. Moreover, if your kitchen runs hot (hello, summer!), pop it in the fridge to avoid melting frosting.
- Refrigerator: Store it in the fridge for up to a week, but let it come to room temp before serving. Honestly, cold cake is good, but room-temp cake? Even better.
- Freezer: Want to save some for later? Wrap individual slices in plastic wrap, then pop them into a freezer bag. Furthermore, they’ll stay fresh for up to 3 months. (Late-night chocolate cake cravings? Covered.)
Serving Suggestions
- Serve your cake with a scoop of vanilla ice cream for that classic combo.
- Add a dollop of whipped cream and fresh berries for a lighter twist. Moreover, if you’re feeling indulgent, drizzle some chocolate syrup on top—because, why not?
Frequently Asked Questions (FAQs)
Why put mayonnaise in chocolate cake?
Honestly, mayonnaise sounds like an odd choice for cake, but it’s a total game-changer. Mayonnaise is made from eggs and oil—two ingredients that cakes already use for moisture and richness. Moreover, adding mayo gives your chocolate cake an ultra-moist texture without making it greasy or heavy. And no, you won’t taste the mayo. Pinky promise!
Can you use mayonnaise instead of oil in box cake mix?
Yep, you totally can! In fact, mayo is a great swap for oil in any cake mix. Moreover, just replace the oil with the same amount of mayonnaise. Not only will it make your box cake mix super moist, but it also adds a little extra richness that oil alone can’t deliver.
How much mayo to add to chocolate cake mix?
If you’re using a box cake mix, add about ½ cup of mayonnaise to the batter. Moreover, you can use it to replace the oil or just add it in for extra moisture. (Trust me, once you try it, you’ll never go back to plain cake mix again.)
Why is it called crazy cake?
Crazy cake, also known as Depression cake or wacky cake, got its name during the Great Depression. With ingredients like eggs, butter, and milk hard to come by, people got creative—thus, the “crazy” part. Moreover, using pantry staples like mayo made it possible to bake a rich, moist cake without the usual ingredients. Crazy, right?
Give Chocolate Mayonnaise Cake a Try!
So, there you have it! Chocolate Mayonnaise Cake might sound a little out there, but trust me, once you take that first bite, you’ll get why this recipe has stood the test of time. It’s rich, moist, and ridiculously easy to make with stuff you probably already have in your kitchen. Plus, watching people’s faces when you tell them the secret ingredient? Priceless.
Honestly, if my picky-eater niece asked for seconds, I’m pretty sure this cake is a winner. So, grab that jar of mayo and whip up a cake that’s guaranteed to have everyone asking for the recipe. And hey—if you give it a go, let me know how it turns out! I’d love to hear from you (especially if you convert any mayo skeptics).
Happy baking!