Step 1: Preheat the Oven
Preheat your oven to 350°F (175°C).
Grease a 9-inch round cake pan or a similar-sized baking dish with butter or nonstick cooking spray. You can also lightly dust the greased pan with flour to help prevent sticking.
Step 2: Combine the Dry Ingredients
In a large mixing bowl, combine the all-purpose flour, granulated sugar, unsweetened cocoa powder, and baking soda.
Whisk the ingredients together until the cocoa powder is evenly distributed and no large lumps remain.
This step helps ensure that the cake rises evenly and develops a consistent chocolate flavor.
Step 3: Add the Mayonnaise
Add the mayonnaise to the dry ingredients.
Using a wooden spoon, hand whisk, or electric mixer on low speed, begin mixing until the mayonnaise is incorporated into the flour mixture.
The batter may look thick at this stage, but that is perfectly normal.
Step 4: Pour in the Water
Gradually add the water while mixing continuously.
Continue stirring until the batter becomes smooth and evenly combined. Scrape down the sides of the bowl with a spatula to make sure no dry flour or cocoa powder remains.
Avoid overmixing once the batter is smooth, as this can make the finished cake denser.
Step 5: Transfer the Batter to the Pan
Pour the chocolate batter into the prepared baking pan.
Use a spatula to spread it evenly, making sure the batter reaches the edges of the pan.
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.
Baking time may vary depending on your oven and the depth of your baking dish.
To check whether the cake is ready, insert a toothpick into the center. If it comes out clean or with a few moist crumbs, the cake is done.
If wet batter remains on the toothpick, bake for another 3–5 minutes and check again.
Step 7: Let the Cake Cool
Remove the cake from the oven and place the pan on a wire rack.
Allow it to cool for about 15–20 minutes before slicing or removing it from the pan.
Letting the cake cool properly helps it set and makes serving easier.
Step 8: Serve and Enjoy
Once cooled, slice the cake and serve it as it is or add your favorite topping.
For an extra-special dessert, try chocolate frosting, a dusting of powdered sugar, whipped cream, or a scoop of vanilla ice cream.
Enjoy a slice with coffee, tea, or a cold glass of milk!
Tips for the Best Chocolate Mayonnaise Cake
Use room-temperature ingredients: Room-temperature mayonnaise and water can help the batter combine smoothly.
Measure the flour correctly: Spoon flour into your measuring cup and level it off rather than packing it down. Too much flour can make the cake dry.
Choose unsweetened cocoa powder: This provides a rich chocolate flavor without adding unnecessary sweetness.
Do not overmix: Mix just until the ingredients are combined to help maintain a tender crumb.
Check the center before removing the cake: Every oven is different, so use a toothpick rather than relying only on the baking time.
Let it cool before frosting: Adding frosting while the cake is hot can cause it to melt and slide off.
Optional Chocolate Frosting
If you want to make this cake even more indulgent, pair it with a simple chocolate buttercream.
Ingredients
- 1/4 cup softened butter
- 1/4 cup unsweetened cocoa powder
- 1 1/2 cups powdered sugar
- 2–3 tablespoons milk
- 1/2 teaspoon vanilla extract
Instructions
- Beat the softened butter in a bowl until creamy.
- Add the cocoa powder and powdered sugar.
- Gradually mix in the milk until the frosting reaches your desired consistency.
- Stir in the vanilla extract.
- Spread the frosting over the completely cooled cake.
- Slice and serve.
How to Store Chocolate Mayonnaise Cake
Store leftover cake in an airtight container at room temperature for up to 2 days in a cool environment.
For longer storage, refrigerate it in a covered container for up to 5 days. Allow refrigerated slices to sit at room temperature briefly before serving for a softer texture.
You can also freeze individual slices. Wrap them tightly and place them in a freezer-safe container for up to 3 months for best quality. Thaw overnight in the refrigerator or until ready to serve.
Frequently Asked Questions
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