The easiest way to feed a crowd with chocolate cake is to make a Chocolate Sheet Cake. This recipe yields a super moist cake topped with a rich coconut fudge icing. It started as a potluck favorite and quickly became a family classic.
Sheet-pan baking is ideal for serving groups, and this chocolate sheet cake is a crowd-pleaser. It delivers a tender crumb and deep chocolate flavor without the fuss of layered cakes. Slice it into squares or larger portions depending on the event—weddings, potlucks, birthdays, or casual gatherings. The coconut fudge icing adds texture and a buttery sweetness that pairs perfectly with the cake. You can customize the topping for different occasions: leave out the coconut for a classic fudge icing, add sprinkles for birthdays, or stir in nuts for extra crunch.
Watch How To Make Chocolate Sheet Cake:
Chocolate Sheet Cake
This sheet-pan chocolate cake is easy to prepare and very forgiving, making it perfect for beginners and experienced bakers alike. The recipe uses simple pantry ingredients and finishes with a hot fudge-style icing that sets into a glossy, slightly firm topping when chilled. Because it bakes thin and wide, each slice has excellent frosting-to-cake balance. It stores well and travels easily, which is why it’s a favored choice for potlucks and receptions.
The recipe shared here is straightforward: a quick cocoa-based batter combined with a small amount of buttermilk and eggs for moisture and lift. After baking, pour hot coconut fudge icing over the cooled cake and refrigerate until the topping firms. The result is a tender, moist sheet cake with a decadent, textured frosting.
How to Make a Chocolate Sheet Cake:
Q&A
Fudge Icing Variations?
This cake adapts well to many icing variations. Ideas include:
- German Chocolate Style – Replace buttermilk in the icing with sweetened condensed milk and stir in coconut and pecans.
- Classic Fudge – Omit the coconut flakes for a smooth, plain fudge topping.
- Confetti Sheet Cake – Pour a plain fudge icing over the cake and sprinkle with colorful confetti sprinkles.
- Mocha Variation – Use brewed coffee in place of some liquid for a coffee-chocolate flavor.
- Birthday Version – Add rainbow sprinkles on top after pouring the icing.
- Peanut Butter Twist – Swap some butter with peanut butter in the icing for a nutty frosting.
- Triple Chocolate – Add mini chocolate chips to the icing for extra texture and chocolate intensity.
What flour should I use?
Cake flour creates the most tender crumb, but all-purpose flour works well too. If you don’t have cake flour, remove 2 tablespoons from every cup of all-purpose flour and replace it with 2 tablespoons of cornstarch to mimic cake flour. Lower-protein flours like pastry flour also produce softer cakes. If using self-rising flour, reduce the added leavening accordingly.
What sheet pan size is best?
An 18×12-inch sheet pan (sometimes sold as 18×13) is ideal for this recipe. The actual bake surface is typically a bit smaller than the labeled size. If you use a smaller pan, the cake will be taller and may need slightly more baking time. Avoid going much smaller than a 14-inch pan unless you want a very thick cake.
Can I make this without buttermilk?
Yes. Buttermilk is recommended when using baking soda because its acidity balances the leavening. If you don’t have buttermilk, mix regular milk with a tablespoon of vinegar or lemon juice and let it sit for a few minutes to curdle. That makes an effective substitute.
How do I get a darker chocolate cake?
Use a combination of regular unsweetened cocoa and a darker Dutch-process or special dark cocoa powder for a richer color and flavor. You can also add a small amount of melted dark chocolate to the batter for a deeper chocolate profile.
Can I use a smaller pan?
Yes, but reduce the pan size carefully. A much smaller pan will produce a thicker cake that requires longer baking and possible adjustments to baking temperature. Try to stay within the 14–18 inch range for best results.
Tips:
- Combine half regular cocoa and half dark cocoa in the batter and icing for a deep chocolate color and balanced flavor.
- For a party cake, add rainbow sprinkles on top of the icing once it’s been poured.
- Substitute chopped pecans, walnuts, or hazelnuts for the coconut if you prefer a nut topping.
- Chill the cake after pouring the icing so it sets firm for clean slices.
Ingredients
Chocolate Cake:
- 1 cup water
- 1 cup butter
- 4 tbsp cocoa
- 2 cups sugar
- 2 cups flour
- 1 tsp baking soda
- 1/2 tsp salt
- 1/2 cup buttermilk (or milk + vinegar)
- 1 tsp vanilla
- 2 eggs
Coconut Fudge Icing:
- 1/2 cup butter
- 4 tbsp cocoa
- 1/4 cup buttermilk (or milk + vinegar)
- 1 tsp vanilla
- 1 1/2 cups powdered sugar
- 1 cup coconut flakes
Instructions
How To Make Chocolate Sheet Cake:
- Combine the water, butter, and cocoa in a small saucepan and bring to a boil, stirring until smooth.
- In a large bowl, whisk together the sugar, flour, baking soda, and salt. Pour the hot cocoa mixture into the dry ingredients and stir to combine.
- Add the buttermilk, vanilla, and eggs to the batter and beat until smooth and well incorporated.
- Pour the batter into a greased 18×12″ sheet pan and bake at 325°F (163°C) for 25–30 minutes, or until a toothpick in the center comes out clean.
To Make Icing:
- In a small saucepan, bring the butter, cocoa, and buttermilk to a gentle boil. Remove from heat and stir in powdered sugar, vanilla, and coconut flakes until smooth.
- Allow the cake to cool, then pour the hot fudge icing evenly over the surface. Refrigerate until the icing firms, then cut into squares and serve.
Notes
- Cocoa: For a darker, richer cake, substitute 2 tablespoons of regular cocoa with Dutch-process or dark cocoa.
- Coconut: Omit the coconut flakes if you prefer a classic smooth fudge topping.
- Make it festive: Top with sprinkles after pouring plain fudge icing for a birthday-style sheet cake.
Nutrition (per serving)
Calories: 271 kcal | Carbs: 34 g | Protein: 2 g | Fat: 15 g