Sheet cake is a classic crowd-pleaser that’s ideal for feeding large groups with minimal fuss. Its thin, even layers bake quickly and frost easily, making it perfect for parties, potlucks, or any event where you need to serve 50 people without spending all day in the kitchen. This recipe scales a moist, flavorful chocolate sheet cake with creamy frosting, designed specifically to yield 50 servings.
Ingredients
- 6 cups all-purpose flour (about 720 grams)
- 6 cups granulated sugar (about 1,200 grams)
- 2 1/2 cups unsweetened cocoa powder (about 250 grams)
- 3 tablespoons baking powder
- 1 1/2 teaspoons baking soda
- 3 teaspoons salt
- 3 cups whole milk, at room temperature
- 1 1/2 cups vegetable oil
- 6 large eggs, at room temperature
- 3 tablespoons pure vanilla extract
- 3 cups boiling water
- For the frosting:
- 3 cups unsalted butter, softened (about 680 grams)
- 9 cups powdered sugar (about 1,080 grams), sifted
- 1 1/2 cups unsweetened cocoa powder (about 150 grams)
- 1/2 cup whole milk, plus more as needed
- 3 teaspoons pure vanilla extract
- 1/2 teaspoon salt
Instructions
- Preheat and prepare pans: Preheat your oven to 350°F (175°C). Grease and flour two 18×24-inch sheet pans or line them with parchment paper for easy removal.
- Mix dry ingredients: In a very large bowl, sift together the flour, sugar, cocoa powder, baking powder, baking soda, and salt. Whisk to combine evenly.
- Combine wet ingredients: In a separate large bowl, whisk together the milk, vegetable oil, eggs, and vanilla extract until smooth.
- Make the batter: Gradually add the wet ingredients to the dry ingredients, mixing with a sturdy spatula or electric mixer on low speed until just combined. Avoid overmixing to keep the cake tender.
- Add boiling water: Slowly pour in the boiling water while stirring gently. The batter will be thin—this is normal and helps keep the cake moist.
- Divide and bake: Pour the batter evenly into the prepared sheet pans. Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean. Rotate pans halfway through baking for even cooking.
- Cool completely: Remove the cakes from the oven and let them cool in the pans for 15 minutes. Then transfer to wire racks to cool completely before frosting.
- Make the frosting: Beat the softened butter in a large bowl with an electric mixer on medium speed until creamy, about 3 minutes. Gradually add powdered sugar and cocoa powder, alternating with milk, beating on low speed until smooth and fluffy. Stir in vanilla and salt. Add more milk if needed for spreadable consistency.
- Assemble the cake: Place one sheet cake layer on a large serving board or tray. Spread about half the frosting evenly on top. Place the second cake layer on top and frost the entire surface and sides with the remaining frosting.
- Serve and enjoy: Slice into approximately 2×2-inch pieces to yield about 50 servings. Serve at room temperature for best flavor and texture.
Tips
- Substitutions: You can substitute buttermilk for the whole milk to add extra tenderness and tang, but reduce the baking powder to 2 tablespoons and omit the baking soda if you do. For a dairy-free version, use almond or oat milk and vegetable oil in place of butter in the frosting.
- Frosting texture: If your frosting is too thick, add milk a teaspoon at a time until it spreads easily. If it’s too thin, add more powdered sugar gradually.
- Common mistakes: Avoid overmixing the batter once wet and dry ingredients are combined; this can make the cake dense. Also, ensure the cake is completely cooled before frosting to prevent melting or sliding.
- Pan sizes: If you don’t have 18×24-inch pans, you can use multiple smaller pans, but adjust baking time accordingly and test for doneness early.
Serving Suggestions
This sheet cake is a versatile dessert that pairs well with a variety of accompaniments. Serve slices with a scoop of vanilla ice cream or a dollop of whipped cream for an indulgent treat. Fresh berries or sliced strawberries add a bright contrast to the rich chocolate flavor. For a party, consider offering coffee, milk, or a simple fruit punch alongside the cake to complement its sweetness.
Variations
To change up the flavor profile, try adding 1 cup of finely chopped nuts or chocolate chips to the batter before baking. You can also swap the cocoa powder for 3 cups of melted white chocolate for a white sheet cake variant. For a layered twist, split the cake into three thinner layers and add raspberry jam or cream cheese frosting between layers. Another option is to add a teaspoon of espresso powder to the batter to intensify the chocolate flavor without making it taste like coffee.
Storage and Reheating
Store the sheet cake covered tightly with plastic wrap or in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate it for up to 5 days, but bring to room temperature before serving to restore softness. You can also freeze the cake (wrapped well in plastic and foil) for up to 3 months; thaw overnight in the refrigerator and then bring to room temperature. To reheat, warm individual slices in the microwave for 10-15 seconds to refresh the texture, but avoid overheating as it can dry out the cake.
Frequently Asked Questions
Can I make this sheet cake gluten-free?
Yes, you can substitute the all-purpose flour with a gluten-free flour blend designed for baking. Make sure the blend contains xanthan gum or add 1 teaspoon per cup of flour to help maintain structure. Baking times may vary slightly, so watch the cake closely.
Why is the batter so thin after adding boiling water?
The boiling water thins the batter intentionally to produce a moist, tender crumb. It dissolves the cocoa powder and helps distribute it evenly. This is normal and necessary for the cake’s texture.
How do I know when the cake is done?
Use a toothpick or cake tester inserted in the center. If it comes out clean or with a few moist crumbs (not wet batter), the cake is done. The edges should start to pull away slightly from the pan.
Can I prepare this cake a day ahead?
Yes, you can bake the cake layers a day in advance and keep them wrapped tightly at room temperature. Frost the cake the day you plan to serve it for the freshest taste and best texture.
What if I only have smaller pans?
Divide the batter evenly among smaller pans, such as 9×13-inch pans, and adjust the baking time to about 25–30 minutes. Check doneness early to avoid overbaking.
Can I use a different frosting?
Absolutely. This cake pairs well with cream cheese frosting, whipped cream frosting, or even a simple dusting of powdered sugar for a lighter option. Adjust sweetness and consistency based on your preference.
This sheet cake recipe is designed to simplify baking for a large group without compromising flavor or texture. Whether for celebrations, office parties, or community events, it offers a reliable, delicious dessert everyone will enjoy.
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