Super-Moist Old-Fashioned Chocolate Mayo Cake

The Old Fashioned Chocolate Mayonnaise Cake is a treasured vintage recipe that might sound surprising at first, but trust us — mayonnaise is the secret to a super-moist, ultra-rich cake. This Depression-era dessert skips the eggs and butter, replacing them with mayo (which is made of eggs and oil!) for a decadent texture and deep cocoa flavor.

The result? A tender, melt-in-your-mouth chocolate cake that’s easy to make with pantry staples, no special equipment, and zero fuss. Topped with a simple fudge frosting or dusted with powdered sugar, it’s ideal for weeknight desserts, potlucks, birthdays, or nostalgic weekend baking.

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Ingredients Overview

This recipe relies on simple, shelf-stable ingredients and a clever technique that dates back nearly a century.

Dry Ingredients

• All-purpose flour: The main structure of the cake.

• Unsweetened cocoa powder: Adds rich chocolate flavor. Use natural cocoa for best rise.

• Baking soda: The leavening agent that reacts with mayo’s acidity.

• Salt: Balances sweetness and deepens flavor.

Wet Ingredients

• Mayonnaise: Use full-fat mayo. It replaces both eggs and oil, giving the cake an incredibly moist texture.

• Sugar: Granulated sugar for sweetness and structure.

• Vanilla extract: Adds warmth and aromatic depth.

• Water or brewed coffee: Hot liquid blooms the cocoa and brings everything together. Coffee enhances the chocolate without making it taste like coffee.

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Step-by-Step Instructions

This recipe makes one 9×13-inch cake or two 8-inch rounds.

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1. Preheat & Prepare Pans

• Preheat oven to 350°F (175°C).

• Grease and flour a 9×13-inch baking pan or line with parchment.

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2. Mix Dry Ingredients

In a large mixing bowl, whisk together:

• 2 cups all-purpose flour

• ⅔ cup unsweetened cocoa powder

• 1½ tsp baking soda

• ½ tsp salt

Set aside.

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3. Mix Wet Ingredients

In another bowl, whisk until smooth:

• 1 cup full-fat mayonnaise

• 1 cup granulated sugar

• 1 tsp vanilla extract

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4. Combine & Add Hot Liquid

• Stir the dry ingredients into the mayo mixture.

• Slowly add 1 cup hot water or brewed coffee, whisking until batter is smooth and lump-free.

• The batter will be thin — this is normal.

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5. Bake

• Pour into prepared pan and smooth the top.

• Bake for 30–35 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.

• Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before frosting.

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Tips, Variations & Substitutions

Pro Tips

• Don’t use light mayo — full-fat is key for texture and flavor.

• Use fresh baking soda for best rise.

• Let the cake cool fully before frosting to prevent melting.

Variations

• Layer Cake: Divide into two 8-inch round pans and bake for 25–28 minutes.

• Chocolate Chips: Stir ½ cup mini chocolate chips into the batter for extra richness.

• Spiced Chocolate: Add ½ tsp cinnamon and a pinch of cayenne for depth.

Substitutions

• No coffee? Just use hot water — still delicious.

• Dairy-free? This cake is already dairy-free if you use vegan mayo.

• Egg allergy? Perfect — no eggs needed, thanks to mayo.

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Serving Ideas & Occasions

This cake is perfect for:

• Birthdays and casual celebrations

• Weeknight baking

• Vintage-themed dinners or potlucks

• Holiday gatherings when you want a make-ahead dessert

Serve with:

• A simple chocolate or fudge frosting

• A dusting of powdered sugar and berries

• A scoop of vanilla or coffee ice cream

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Nutritional & Health Notes

While rich and indulgent, this cake is egg-free and butter-free, making it accessible for certain dietary needs.

Approximate (1 of 12 slices):

• Calories: ~330

• Fat: ~14g

• Carbs: ~47g

• Sugar: ~26g

• Protein: ~3g

To reduce sugar:

• Use ¾ cup sugar instead of 1 cup — still moist and sweet.

To lighten:

• Use avocado oil mayo for healthier fats.

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FAQs

Q1: Why use mayonnaise in cake?

Mayonnaise is made from oil and eggs — both essential cake ingredients. It keeps the cake super moist, even after a day or two, and creates a soft, dense crumb.

Q2: Can I use light mayonnaise?

It’s not recommended. Light mayo has more water and less fat, which can affect texture and moisture.

Q3: Can I make this cake ahead?

Yes! This cake stays moist for up to 3 days when stored covered at room temperature.

Q4: Can I freeze this cake?

Absolutely. Wrap the cooled, unfrosted cake tightly and freeze for up to 3 months. Thaw at room temperature before serving.

Q5: What kind of frosting works best?

A fudge frosting, ganache, or classic chocolate buttercream all pair beautifully. For a lighter finish, try whipped cream and berries.

Q6: Can I make it gluten-free?

Yes — use a 1:1 gluten-free baking blend. The mayo helps keep it tender even without gluten.

Q7: What makes this a “Depression-era” cake?

During the Great Depression, eggs and butter were expensive. Home bakers found that mayonnaise was a thrifty substitute — and the result was incredibly moist, rich cakes.

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