Moist Chocolate Sheet Cake With Chocolate Frosting

Name: Moist Chocolate Sheet Cake With Chocolate Frosting
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Yield: 16 servings
Ingredients: 2 cups all-purpose flour; 2 cups granulated sugar; 3/4 cup unsweetened cocoa powder; 1 1/2 tsp baking powder; 1 1/2 tsp baking soda; 1 tsp salt; 2 large eggs; 1 cup whole milk; 1/2 cup vegetable oil; 2 tsp vanilla extract; 1 cup boiling water; 1/2 cup strong brewed coffee; 1 cup unsalted butter, softened; 3 1/2 cups powdered sugar; 1/2 cup unsweetened cocoa powder; 1/4 cup milk; 2 tsp vanilla extract

Highlighted under: Home-Baked Happiness

I absolutely love baking this Moist Chocolate Sheet Cake with Chocolate Frosting for gatherings! The rich, chocolatey flavor is a hit with everyone, and I can make it in one pan, which means less cleanup. I enjoy watching the cake rise in the oven, filling my kitchen with its irresistible aroma. Once it's frosted, I can barely wait to share it with friends and family, and the compliments I receive are always so rewarding!

Created by

Erin Wallace

Last updated on 2026-03-05T05:25:53.463Z

Every time I make this cake, I am reminded of the joy of baking. The texture is uniquely moist, thanks to the combination of oil and eggs. It's not overly sweet, making it perfect with the rich chocolate frosting that I whip up in no time. I make sure to let the cake cool completely before frosting to get that perfect glossy finish.

One trick I've learned is to use high-quality cocoa powder, which gives the cake a deeper flavor. I also find that using strong brewed coffee enhances the chocolate taste without actually making the cake taste like coffee. Trust me on this, it’s a game-changer!

Why You Will Love This Recipe
Rich chocolate flavor paired with velvety chocolate frosting
Incredibly moist texture that keeps you coming back for more
Simplicity of one-pan baking for a stress-free experience

Understanding the Ingredients

Each ingredient in this Moist Chocolate Sheet Cake plays a crucial role in achieving the ultimate texture and flavor. For instance, the combination of all-purpose flour and granulated sugar creates a tender crumb, while cocoa powder provides the deep chocolate flavor that's essential to this cake. Don't skip the brewed coffee; it enhances the cocoa, resulting in a richer chocolate taste that elevates the overall flavor profile. If you want a less intense flavor, consider using half the amount of coffee.

The eggs in this recipe are not just binding agents; they also contribute to the cake's moisture and structure. When baking, using large eggs ensures consistency in size and weight, affecting the cake's rise and texture. If you're looking for an egg substitute, try using a flaxseed meal mixed with water (1 tablespoon of flaxseed meal with 3 tablespoons of water equals one egg) for a vegan option, keeping in mind this may slightly alter the texture.

Baking Tips for Success

To ensure that your cake rises perfectly, always preheat your oven to the specified temperature. An oven that isn't fully heated can lead to uneven baking, which is a common pitfall. Once in the oven, keep an eye on the cake; it should spring back to the touch and might begin to pull away slightly from the edges of the pan. An inserted toothpick should come out clean or with a few moist crumbs, indicating doneness without being overly dry.

When preparing your baking pan, be generous with the greasing to avoid sticking, especially along the edges. I often use parchment paper for an extra layer of insurance—simply cut it to fit the bottom of the pan and grease the sides. This not only makes for easier removal but also helps maintain the cake’s moistness. If you happen to overbake, consider brushing the top with a simple syrup to reintroduce moisture.

Ingredients

For the Cake

2 cups all-purpose flour
2 cups granulated sugar
3/4 cup unsweetened cocoa powder
1 1/2 tsp baking powder
1 1/2 tsp baking soda
1 tsp salt
2 large eggs
1 cup whole milk
1/2 cup vegetable oil
2 tsp vanilla extract
1 cup boiling water
1/2 cup strong brewed coffee

For the Frosting

1 cup unsalted butter, softened
3 1/2 cups powdered sugar
1/2 cup unsweetened cocoa powder
1/4 cup milk
2 tsp vanilla extract

Instructions

Instructions

Prepare the Cake

Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan. In a large bowl, mix together flour, sugar, cocoa, baking powder, baking soda, and salt. Add eggs, milk, oil, and vanilla, mixing until well combined. Slowly stir in the boiling water and coffee. Pour the batter into the prepared pan and bake for 30 minutes.

Make the Frosting

While the cake cools, prepare the frosting. In a bowl, beat the softened butter until creamy. Gradually add powdered sugar and cocoa, alternating with milk, until you reach a spreadable consistency. Mix in vanilla.

Frost the Cake

Once the cake is completely cooled, spread the frosting evenly across the top. Decorate as desired.

Pro Tips

For an extra touch, try adding chocolate shavings or sprinkles on top of the frosting. This cake also pairs beautifully with a scoop of vanilla ice cream.

Serving and Storing

Once frosted, you can store the cake covered at room temperature for up to three days. If it’s warm in your kitchen, consider refrigerating it to prolong freshness. If you want to prepare it in advance, both the cake and frosting can be made a day ahead. Just frost it on the day you plan to serve; this ensures the frosting remains fluffy and vibrant. If you have leftovers, slice them into pieces before storing to make it easier to serve later on.

For presentation, consider garnishing the frosted cake with chocolate shavings or sprinkles to add a playful touch. A sprinkle of sea salt can also enhance the chocolate flavor and make each bite extra special. Pairing slices with a scoop of vanilla ice cream or a dollop of whipped cream elevates this simple sheet cake into a delightful dessert experience.

Variations and Adaptations

Feel free to customize this chocolate sheet cake with other flavors by substituting the vanilla extract with peppermint or almond for a unique twist. Additionally, consider mixing in chocolate chips or chopped nuts for added texture. If you prefer a cake with a bit of spice, add a teaspoon of cinnamon or espresso powder to the dry ingredients for an interesting flavor depth without overwhelming the chocolate.

For a lighter version, you can substitute some of the vegetable oil with applesauce, which not only reduces calories but also adds moisture. Another potential adaptation is to use gluten-free flour to accommodate dietary restrictions, although you may need to adjust the baking time slightly, as gluten-free alternatives can affect the cake's rise and texture.

Questions About Recipes

→ Can I use a different size pan?

Yes, but you will need to adjust the baking time. A smaller pan will require more time, while a larger pan will take less.

→ How should I store leftovers?

Store leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for a week.

→ Can I use cake flour instead of all-purpose flour?

Yes, cake flour will make the cake even more tender! Just remember to adjust the liquid slightly.

→ Is it possible to make this cake gluten-free?

Absolutely! Substitute the all-purpose flour with a 1:1 gluten-free flour blend.