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The beauty of this copycat Portillo’s chocolate cake lies in its simplicity. You don’t need a pantry full of specialty items to achieve that signature moist, rich, and deeply flavorful result. Each ingredient plays a crucial role in mimicking the taste and texture of the original. For precise measurements, be sure to check the full recipe card located at the bottom of this post.

• Mayonnaise: This is our star secret ingredient! It’s the key to achieving the cake’s legendary moistness and tender crumb. We’ll delve deeper into why mayo works wonders in baking below, dispelling any doubts you might have.
• Box of Betty Crocker Devil’s Food Cake Mix: Forget making a complicated chocolate cake from scratch (though we love those too, like our simple chocolate cake with buttercream frosting!). For this copycat, a high-quality boxed mix is essential. Devil’s food cake is specifically chosen for its deep, intense chocolate flavor and inherent moist characteristics. Using Betty Crocker is not only convenient but also aligns with the rumored original recipe, ensuring authentic results.
• Large Eggs: Eggs serve multiple purposes in baking. They act as a binding agent, holding the cake batter together and providing crucial structure. Beyond that, they contribute significantly to the cake’s overall richness, moisture, and help create that desirable tender texture.
• Ice Cold Water: This might seem like a small detail, but using ice-cold water is vital. It helps to control the activation of gluten in the flour, preventing the cake from becoming overly dense or tough. The cold temperature also ensures a more tender and lighter crumb, perfectly complementing the richness of the devil’s food mix and mayonnaise.
• Betty Crocker Chocolate Frosting (Canned): Just as surprising as the mayonnaise, Portillo’s reportedly uses canned frosting for their famous cake. While you might be tempted to make homemade frosting, sticking to a quality canned chocolate frosting, especially Betty Crocker, is essential for a true copycat experience. We’ll show you a simple trick to elevate its texture even further.

Let’s talk more about the true star of this recipe: mayonnaise. Many bakers are hesitant to use mayonnaise in cake batters, fearing a savory taste or an unusual texture. However, the truth is, mayonnaise is simply an emulsion of oil, egg yolks, and a touch of acid (like vinegar or lemon juice). These are all ingredients commonly found in traditional cake recipes! When added to a cake mix, mayonnaise works wonders:

• Unparalleled Moisture: The oil content in mayonnaise provides incredible moisture to the cake, creating a crumb that is tender and succulent, resisting dryness for days.
• Richness and Flavor Depth: The egg yolks contribute to a richer, more luxurious texture and deepen the overall chocolate flavor, making it taste even more indulgent.
• Fine, Tender Crumb: Mayonnaise helps to create a finely textured crumb, making each bite incredibly soft and pleasant.
• No Mayonnaise Taste: Rest assured, your cake will not taste like mayonnaise! The other ingredients and the baking process transform it into an invisible powerhouse of moisture and richness.

Embrace the mayonnaise; it’s the secret weapon that elevates this cake from good to absolutely legendary, just like Portillo’s!

Creating this copycat Portillo’s Chocolate Cake is surprisingly simple and immensely rewarding. Follow these easy steps to achieve a moist, chocolatey masterpiece. Remember to consult the complete recipe card at the end of this article for precise measurements and detailed instructions.

1. Prepare Your Oven and Pans: Begin by preheating your oven to 350°F (175°C). This ensures even baking from the moment your cakes go in. Thoroughly grease and flour two 9-inch round cake pans. Greasing prevents sticking, and flouring creates a non-stick surface, ensuring your cakes release perfectly.
2. Whip Up the Batter: In a large mixing bowl, combine the entire box of Betty Crocker Devil’s Food cake mix, the three large eggs, one cup of ice-cold water, and the one cup of mayonnaise. Using an electric mixer, start by mixing on low speed for about 30 seconds, just to bring the ingredients together. Then, increase the speed to high and beat the mixture for approximately 4 minutes. This vigorous mixing incorporates air and develops the cake’s structure, contributing to its light yet moist texture.
3. Divide and Bake: Carefully divide the smooth, rich chocolate batter evenly between your two prepared 9-inch cake pans. Use a spatula to scrape out all the delicious batter. Place the pans into your preheated oven and bake for 30-32 minutes. The cakes are done when a wooden toothpick inserted into the center comes out clean, with no wet batter clinging to it. Be careful not to overbake, as this can lead to a dry cake.
4. Cooling is Key: Once baked, remove the cakes from the oven. Allow them to cool in their pans for about 5-10 minutes. This initial cooling helps the cakes firm up, making them less fragile. After this brief rest, carefully invert the cakes onto wire cooling racks. Allow them to cool completely for at least an hour, or until they are cool to the touch. This step is crucial before frosting, as warm cakes will melt the frosting and cause it to slide off.
5. Prepare the Frosting and Assemble: While the cakes cool, you can prepare your frosting (see the next section for a pro tip!). Once the cakes are entirely cool, you’re ready to frost your masterpiece.

Pro Tip for the Perfect Finish!

It is absolutely critical to let the cake layers cool completely before you even think about applying frosting. If the cakes are even slightly warm, two things will happen: the delicate cake will be prone to tearing and crumbling, and the frosting will melt, creating a messy, unappealing disaster. Patience is a virtue in baking, especially when it comes to cooling!

To ensure your Portillo’s Chocolate Cake copycat is nothing short of perfection, keep these extra tips in mind:

• Chill the Frosting (If Needed): If you find your whipped frosting is too soft or runny, particularly in a warm kitchen, pop it into the refrigerator for 10-15 minutes. This brief chill will help it firm up to a more spreadable consistency. Give it a quick stir before applying.
• Do NOT Skip the Mayonnaise: Seriously, this is the cornerstone of achieving that signature moist texture. Don’t be tempted to substitute it or leave it out. Trust the process; the mayo works its magic invisibly!
• Measure Accurately: While this recipe uses a boxed mix, precise measurements for the added ingredients like water, eggs, and especially mayonnaise are important for consistency. Use proper measuring cups and spoons.
• Don’t Overmix the Batter (After Initial High Speed): Once you’ve mixed on high for 4 minutes, stop. Overmixing can develop too much gluten, leading to a tougher cake.
• Invest in Good Cake Pans: Quality 9-inch round cake pans with light-colored, even surfaces will bake more uniformly, preventing burnt edges or undercooked centers.