Portillo’s Chocolate Cake Recipe

If you’ve ever enjoyed a slice of the famous Chicago-style chocolate cake, you know exactly why it’s legendary. This Portillo’s chocolate cake recipe recreates that incredibly moist texture, deep chocolate flavor, and silky chocolate frosting right in your own kitchen.

The secret behind its tender crumb is a simple ingredient many home bakers overlook—mayonnaise. Since mayonnaise is made from eggs and oil, it adds richness and moisture without making the cake taste like mayo. That’s one of the signature characteristics found in many popular copycat versions of this beloved dessert.

Whether you’re baking for a birthday, holiday, or simply satisfying a chocolate craving, this homemade version delivers bakery-quality results every time.

Why You’ll Love This Recipe

• Ultra moist and tender cake layers
• Rich chocolate flavor without being overly sweet
• Smooth, creamy homemade chocolate frosting
• Easy ingredients found in most kitchens
• Perfect for birthdays and celebrations
• Better than many bakery cakes

Ingredients

For the Chocolate Cake

• 2 cups all-purpose flour
• ½ cup unsweetened cocoa powder
• 1¼ teaspoons baking soda
• ½ teaspoon baking powder
• 1 teaspoon instant coffee granules
• ½ teaspoon salt
• 3 large eggs
• 1 cup mayonnaise
• 1 cup granulated sugar
• 1¼ cups water
• 1 teaspoon vanilla extract
• ½ cup semi-sweet chocolate chips (optional)

For the Chocolate Frosting

• 1 cup unsalted butter, softened
• ½ cup cocoa powder
• 5 cups powdered sugar
• 1 teaspoon vanilla extract
• 2–3 tablespoons milk, as needed

Kitchen Equipment

• Two 9-inch round cake pans
• Mixing bowls
• Electric mixer
• Rubber spatula
• Cooling rack
• Offset spatula for frosting

How to Make Portillo’s Chocolate Cake Recipe

Step 1: Prepare the Oven

Preheat your oven to 350°F (175°C).

Grease two 9-inch cake pans and line the bottoms with parchment paper.

Step 2: Combine Dry Ingredients

In a large bowl whisk together:

• Flour
• Cocoa powder
• Baking soda
• Baking powder
• Instant coffee
• Salt

Mix until evenly combined.

Step 3: Add Wet Ingredients

Add:

• Eggs
• Mayonnaise
• Sugar
• Water
• Vanilla extract

Mix until the batter becomes smooth.

Avoid overmixing.

Fold in chocolate chips if using.

Step 4: Bake

Divide the batter evenly between the prepared pans.

Bake for 20–25 minutes, or until a toothpick inserted in the center comes out clean.

Allow cakes to cool for about 10 minutes before transferring them to a wire rack.

Step 5: Make the Frosting

Beat softened butter until creamy.

Mix in cocoa powder.

Gradually add powdered sugar while beating continuously.

Add vanilla extract and enough milk to create a fluffy, spreadable frosting.

Beat for another 1–2 minutes until light and smooth.

Step 6: Assemble

Place one cake layer on a serving plate.

Spread a generous layer of frosting over the top.

Add the second cake layer.

Cover the entire cake with the remaining frosting.

Smooth the sides and top before serving.

Tips for the Best Portillo’s Chocolate Cake Recipe

• Use room-temperature ingredients for smoother mixing.
• Instant coffee enhances chocolate flavor without making the cake taste like coffee.
• Don’t overbake—this cake should remain incredibly moist.
• Cool completely before frosting.
• Refrigerate for 20 minutes before slicing for cleaner cuts.

Why Mayonnaise Works

Many people are surprised by the mayonnaise, but it’s one of the reasons this cake is famous.

Mayonnaise contains oil and eggs, which help create:

• Extra moisture
• Soft crumb
• Rich texture
• Longer-lasting freshness

It’s a classic baking trick used in many chocolate cake recipes and is commonly associated with Portillo’s-style copycat cakes.

Variations

Chocolate Cupcakes

Bake in cupcake liners for 18–20 minutes.

Chocolate Layer Cake

Double the frosting for thicker filling between layers.

Chocolate Sheet Cake

Bake in a 9×13-inch pan for approximately 35 minutes.

Espresso Chocolate Cake

Increase instant coffee to 2 teaspoons for a richer chocolate flavor.

Storage

Room Temperature: Up to 2 days in an airtight container.

Refrigerator: Up to 5 days.

Freezer: Wrap unfrosted cake layers tightly and freeze for up to 3 months.

What to Serve With

• Vanilla ice cream
• Fresh strawberries
• Chocolate drizzle
• Hot coffee
• Cold milk
• Whipped cream

Frequently Asked Questions

What makes Portillo’s chocolate cake so moist?

The combination of mayonnaise, eggs, and oil creates an incredibly soft and moist cake that stays fresh longer than many traditional chocolate cakes.

Does the cake taste like mayonnaise?

Not at all. The mayonnaise simply adds richness and moisture without affecting the flavor.

Can I make this ahead of time?

Yes. In fact, many bakers find the cake tastes even better the next day after the flavors have had time to develop.

Can I freeze the cake?

Yes. Freeze the unfrosted layers for up to three months, then thaw and frost before serving.

Can I use Dutch-process cocoa?

Yes, but natural cocoa powder offers the closest flavor and texture to many popular copycat versions.

Final Thoughts

This Portillo’s chocolate cake recipe brings the iconic bakery-style dessert into your own kitchen with simple pantry ingredients and straightforward steps. The result is a rich, incredibly moist chocolate cake topped with luscious homemade frosting that’s perfect for birthdays, family gatherings, or whenever a chocolate craving strikes.

If you’re searching for the ultimate homemade chocolate cake, this copycat recipe is one you’ll want to bake again and again.