Some cakes are made for small family dinners. Others are built for school events, birthdays, office gatherings, and situations where people unexpectedly ask, “Is there more?” This is one of those cakes.

The biggest problem with large chocolate cakes is consistency. Scaling recipes up sounds simple, but doubling ingredients often creates dense texture, uneven baking, or dry edges with an undercooked center. A cake designed for a crowd needs volume without becoming heavy.

That is where the Thermomix helps. Instead of multiple bowls and long mixing times, it creates a smoother batter with less effort and more consistency. But there is still a mistake people make: overmixing.

Many assume longer mixing automatically creates a better cake batter. It does not. Overworked batter can create a tougher texture and reduce softness. The goal is combining ingredients evenly, not endlessly.

Another issue with large cakes is moisture. Big cakes dry out faster than people expect because they bake longer and have more surface area. This recipe keeps enough moisture to stay soft without becoming overly rich or sticky.

This is the kind of cake that works when you need reliability more than decoration. It cuts cleanly, serves a large group, and handles frosting well. Whether it goes to a school fundraiser, birthday table, or family gathering, it solves one problem: feeding many people without making multiple desserts.

Thermomix Chocolate “Feed a Crowd” Cake Recipe

Recipe Details

Calories: Approximately 320–380 calories per serving
(depends on frosting and slice size)

Servings: 20–24 servings

Prep Time: 15 minutes

Cook Time: 40–45 minutes

Cooling Time: 30 minutes

Total Time: About 1 hour 30 minutes

Ingredients

For the Cake

1 cup hot coffee or hot water

3 cups all-purpose flour

2 cups sugar

3/4 cup cocoa powder

2 teaspoons baking powder

2 teaspoons baking soda

1 teaspoon salt

3 eggs

1 cup vegetable oil

2 cups milk

2 teaspoons vanilla extract

Optional Chocolate Frosting

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

Directions

Prepare the Pan

Preheat oven to 350°F (175°C).

Grease a large sheet pan or deep rectangular baking tray and line with parchment paper if needed.

Add Dry Ingredients

Place flour, sugar, cocoa powder, baking powder, baking soda, and salt into the Thermomix bowl.

Mix 10 seconds / Speed 5.

Add Wet Ingredients

Add eggs, oil, milk, and vanilla.

Mix 20 seconds / Speed 5.

Scrape down the sides if needed.

Add Hot Liquid

Pour in hot coffee or water.

Mix 10 seconds / Speed 4.

The batter will look thinner than expected. That is normal.

Bake

Pour batter into the prepared pan.

Bake for 40–45 minutes, or until a toothpick inserted in the center comes out with only a few moist crumbs.

Avoid opening the oven repeatedly. Large cakes sink more easily than smaller cakes.

Make the Frosting (Optional)

Add butter, powdered sugar, cocoa powder, milk, and vanilla to the Thermomix.

Mix 30 seconds / Speed 4 until smooth.

Spread evenly over the cooled cake.

Serving Ideas

Works well with:

• Vanilla ice cream
• Fresh berries
• Chocolate shavings
• Sprinkles
• Whipped cream

Storage

• Room Temperature: Up to 3 days
• Refrigerator: Up to 1 week
• Freezer: Up to 2 months

Cover tightly before storing. Large cakes dry out faster than people expect if left exposed.