Step 1: Prepare the Oven and Baking Pan
Preheat your oven to 180°C (350°F).
Grease a 9-inch round cake pan or an appropriately sized baking dish with butter or cooking spray. Lightly dust with flour or line the bottom with parchment paper.
Step 2: Combine the Dry Ingredients
In a large mixing bowl, sift together the flour, sugar, cocoa powder, baking soda, and salt.
Whisk everything together until evenly combined, making sure there are no large cocoa lumps.
Step 3: Add the Mayonnaise
Add the mayonnaise to the dry ingredients.
Using a hand mixer or whisk, begin mixing on low speed until the mayonnaise is incorporated into the flour mixture.
The mixture may look slightly crumbly at this stage. This is completely normal.
Step 4: Add Water and Vanilla
Gradually pour in the water while mixing.
Add the vanilla extract and continue mixing until the batter becomes smooth, thick, and evenly combined.
Scrape down the sides of the bowl with a spatula to make sure all the ingredients are incorporated.
Avoid overmixing, as this can make the cake dense.
Step 5: Pour the Batter into the Pan
Pour the chocolate cake batter into your prepared baking pan.
Use a spatula to spread it evenly and gently tap the pan against the countertop to release any large air bubbles.
Step 6: Bake the Cake
Place the pan in the preheated oven and bake for approximately 30–35 minutes.
Check for doneness by inserting a toothpick into the center. If it comes out clean or with a few moist crumbs, the cake is ready.
Avoid overbaking to preserve its wonderfully moist texture.
Step 7: Cool and Serve
Remove the cake from the oven and allow it to cool in the pan for about 10–15 minutes.
Transfer it to a cooling rack if desired and let it cool completely before slicing.
Serve plain or add your favorite chocolate frosting.
Optional Chocolate Frosting
For an extra indulgent finish, prepare this simple chocolate frosting.
Ingredients:
- ½ cup butter, softened
- ¼ cup unsweetened cocoa powder
- 2 cups powdered sugar
- 3 tablespoons milk
- 1 teaspoon vanilla extract
Instructions:
- Beat the softened butter until creamy.
- Add the cocoa powder and powdered sugar gradually.
- Pour in the milk and vanilla extract.
- Beat until smooth, fluffy, and spreadable.
- Spread the frosting evenly over the completely cooled cake.
Grandma’s Helpful Baking Tips
- Use full-fat mayonnaise for the richest texture.
- Make sure your baking soda is fresh.
- Sift the cocoa powder to avoid lumps.
- Room-temperature water helps the batter combine smoothly.
- Do not overmix the batter.
- Let the cake cool before adding frosting.
- For a coconut variation, add ½ cup shredded coconut and replace the chocolate cocoa flavor with additional vanilla if desired.
How to Store Chocolate Mayonnaise Cake
- Room temperature: Store in an airtight container for up to 2 days in a cool environment.
- Refrigerator: Keep covered for up to 5 days.
- Freezer: Wrap individual slices tightly and freeze for up to 2 months.
Frequently Asked Questions
Can you taste the mayonnaise?
No! When properly mixed and baked, the mayonnaise flavor disappears, leaving behind a moist and delicious chocolate cake.
Why does mayonnaise work in cake?
Mayonnaise contains oil and egg, which contribute fat, moisture, and richness to the cake.
Can I make this cake without a mixer?
Absolutely! A hand whisk and spatula are enough to prepare this simple recipe.
Can I add chocolate chips?
Yes! Add ½ cup of chocolate chips to the batter before baking for extra chocolate flavor.
Final Thoughts
This old-fashioned chocolate mayonnaise cake proves that sometimes the most unexpected ingredients create the most delicious desserts.
It’s wonderfully moist, deeply chocolatey, inexpensive to make, and perfect for sharing with family and friends.
One bite is all it takes to understand why Grandma’s mayonnaise cake has remained a beloved family favorite for generations! 🍫❤️
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