Name: Irresistibly Moist Chocolate Sheet Cake in One Easy Bowl
Prep time: 15 min
Cook time: 35 min
Total time: 65 min
Ingredients: 2 cups granulated sugar (can substitute with coconut sugar); 1.75 cups all-purpose flour (can use gluten-free flour blend); 0.75 cups Dutch cocoa powder (unsweetened cocoa powder is a fine substitute); 1.5 teaspoons baking soda; 1.5 teaspoons baking powder; 1 teaspoon salt (kosher salt can be used); 2 teaspoons vanilla extract (can swap with almond extract); 2 large eggs (flax eggs can be used as vegan alternative); 1 cup buttermilk (mix 2/3 cup milk with 2 tablespoons vinegar); 0.5 cups neutral oil (melted coconut oil is a flavorful replacement); 0.5 cups sour cream (yogurt can also be used); 2 teaspoons instant coffee powder (can be omitted); 4 ounces dark chocolate (semi-sweet chocolate is an alternative); 1 cup boiling water; 0.5 cups melted unsalted butter; 0.75 cups Dutch cocoa powder (dark cocoa gives a richer taste); 3 cups powdered sugar (sift for a smoother texture); 0.25 cups warm milk (do not use cold milk)

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“Just one bite of this moist chocolate sheet cake, and I’m transported back to family gatherings where dessert was the highlight of the day. As a chocolate lover, I always find myself craving this comforting treat, especially when I’m short on time. This easy baking recipe is effortlessly crafted in just one bowl, making it a dream come true for busy home chefs like us. Not only is it rich and deeply satisfying, but it also boasts a fuss-free cleanup. Whether it’s for a birthday, a potluck, or simply to enjoy after a long day, this cake is bound to become your new go-to indulgence. What will you pair it with—a scoop of ice cream, or perhaps some fresh berries?”

Why is This Cake a Must-Try?

Irresistibly Moist: This chocolate sheet cake is so incredibly moist, it practically melts in your mouth, making it a delightful treat for any occasion.
Effortless Cleanup: With just one bowl needed for mixing, you’ll save time on cleanup and get back to enjoying your delicious dessert faster!
Versatile Serving Options: Pair it with a scoop of vanilla ice cream or fresh berries for an elevated touch—perfect for gatherings or cozy nights in.
Rich Flavor & Texture: The decadent chocolate flavor, combined with the rich frosting, creates a harmony that’s hard to resist. Each bite is pure bliss!
Perfect for Celebrations: Whether it’s a birthday or a potluck, this cake is sure to impress your friends and family, earning you rave reviews.
Try it alongside other fantastic recipes like our Double Chocolate Muffins for a chocolate lover’s feast!

Moist Chocolate Sheet Cake Ingredients

For the Cake

Granulated Sugar – Sweetens the cake and helps create a moist texture; substitute with coconut sugar for a healthier option.
All-Purpose Flour – Provides structure for the cake; use a gluten-free flour blend for a gluten-free version.
Dutch Cocoa Powder – Imparts a deep chocolate flavor; unsweetened cocoa powder is a fine substitute if needed.
Baking Soda & Baking Powder – Essential leavening agents for rising; always check for freshness for the best results.
Salt – Balances sweetness and enhances flavors; kosher salt can be used as a direct substitute.
Vanilla Extract – Adds depth of flavor; you can swap it for almond extract for a unique twist.
Large Eggs – Bind the ingredients and enhance moisture; flax eggs make a great vegan alternative.
Buttermilk – Contributes to the cake’s moist texture; mix 2/3 cup milk with 2 tablespoons vinegar or lemon juice as a substitute.
Neutral Oil – Keeps the cake moist and tender; melted coconut oil is a flavorful replacement.
Sour Cream – Provides tang and adds moisture; yogurt can also work well in place of sour cream.
Instant Coffee Powder – Boosts chocolate flavor without a coffee taste; you can omit it for a straightforward chocolate experience.
Dark Chocolate – Adds richness; semi-sweet chocolate can be an alternative but may increase sweetness.
Boiling Water – Melts the chocolate and enhances flavor; stick with boiling water for the best texture results.

For the Frosting

Melted Butter – Forms the base of the frosting; unsalted is preferable for control over saltiness.
Dutch Cocoa Powder – Reinforces the chocolate flavor in the frosting; dark cocoa gives a richer taste.
Powdered Sugar – Sweetens and thickens the frosting; sift it for a smoother texture.
Warm Milk – Helps to blend the frosting ingredients; do not use cold milk to ensure easy mixing.

With these ingredients, you’ll create a moist chocolate sheet cake that brings warmth and joy to every gathering!

Step‑by‑Step Instructions for Moist Chocolate Sheet Cake

Step 1: Preheat the Oven
Begin by preheating your oven to 350°F (175°C). As the temperature rises, take a 9×13 inch baking pan and line it with parchment paper, ensuring that the sides are covered. This step helps the cake lift effortlessly after baking, making it a breeze to serve your delicious moist chocolate sheet cake later on.

Step 2: Mix the Dry Ingredients
In a large mixing bowl, combine 2 cups of granulated sugar, 1 ¾ cups of all-purpose flour, ¾ cup of Dutch cocoa powder, 1 ½ teaspoons of baking soda, 1 ½ teaspoons of baking powder, and 1 teaspoon of salt. Whisk these dry ingredients together until they are uniformly blended, which will ensure even rising and a delightful texture in your chocolate sheet cake.

Step 3: Add the Wet Ingredients
Next, add the wet ingredients to your bowl. Crack in 2 large eggs, then mix in 1 cup of buttermilk, ½ cup of sour cream, ½ cup of neutral oil, and 2 teaspoons of vanilla extract. Using a whisk, stir everything gently until just combined. Be careful not to overmix—this helps keep your cake light and moist.

Step 4: Prepare the Chocolate Mixture
In a separate bowl, combine 2 teaspoons of instant coffee powder, 4 ounces of chopped dark chocolate, and 1 cup of boiling water. Whisk until smooth and all the chocolate is melted. This rich mixture is key to enhancing the flavors of your moist chocolate sheet cake. Once blended, pour this chocolate mixture into the cake batter, folding gently to combine.

Step 5: Bake the Cake
Pour the combined batter into your prepared 9×13 inch pan, spreading it evenly with a spatula. Place the pan in the preheated oven and bake for 30-35 minutes. To check for doneness, insert a toothpick into the center; it should come out with a few moist crumbs—not wet batter—indicating your chocolate sheet cake is ready.

Step 6: Cool the Cake
Once baked, remove the pan from the oven and allow the cake to cool in the pan for about 15 minutes. This cooling period helps the cake set and makes it easier to remove later. Afterward, transfer the cake to a wire rack to cool completely, ensuring it’s ready for that luscious frosting you’ll prepare next.

Step 7: Make the Frosting
While the cake cools, prepare your frosting. In a mixing bowl, whisk together ½ cup of melted unsalted butter, ¾ cup of Dutch cocoa powder, and 1 teaspoon of instant coffee powder. Gradually add ¼ cup of warm milk, followed by 3 cups of powdered sugar, beating until the frosting is smooth and fluffy. This decadent topping will beautifully complement your moist chocolate sheet cake.

Step 8: Frost and Serve
Once the cake has cooled completely, generously spread the chocolate frosting over the top using a spatula. Ensure an even distribution for that perfect finish. Finally, cut the cake into squares, serve on your favorite plates, and relish every rich, chocolatey bite of your moist chocolate sheet cake!

Variations & Substitutions for Moist Chocolate Sheet Cake

Feel free to experiment and make this moist chocolate sheet cake truly your own with these delicious twists!

Milk Chocolate: Swap dark chocolate for milk chocolate for a sweeter and creamier taste that delights every chocolate lover.
Add Ins: Toss in a handful of chocolate chips or chopped nuts for delightful texture contrasts that every bite will enjoy.
Fruit Surprise: Substitute half the sugar with pureed fruit like applesauce for a healthier option that still satisfies the sweet tooth.
Gluten-Free Version: Replace all-purpose flour with a gluten-free flour blend, ensuring everyone can indulge in this crowd-pleaser.
Dairy-Free Delight: Use almond milk and coconut yogurt instead of buttermilk and sour cream to create a dairy-free version that’s still incredibly moist.
Minty Fresh: Add a teaspoon of peppermint extract to the batter for a fun, seasonal twist that pairs wonderfully with chocolate.
Espresso Edge: For an extra kick, replace the instant coffee powder with a splash of brewed coffee to intensify the chocolate flavor even more.
Spicy Heat: Mix in a pinch of cayenne pepper or chili powder for a surprising heat that beautifully complements the chocolate.

Exploring these variations makes this cake not just a dessert, but a delightful canvas for creativity. You might also enjoy serving it alongside dishes like our Delicious Mint Chocolate Chip Protein Balls for a sweet snack lineup!

How to Store and Freeze Moist Chocolate Sheet Cake

Room Temperature: Keep the frosted cake in an airtight container at room temperature for up to 3 days to enjoy its maximum moisture and flavor.

Fridge: If you prefer longer freshness, store the cake in the fridge for up to 5 days. Ensure it’s covered to prevent it from drying out.

Freezer: The unfrosted cake can be frozen for up to 3 months; tightly wrap it in plastic wrap and foil before freezing. Thaw in the fridge overnight before frosting.

Reheating: If you’d like to enjoy the cake warm, pop individual slices in the microwave for about 10-15 seconds for a cozy dessert experience!

What to Serve With Moist Chocolate Sheet Cake

As you savor each slice of this rich chocolate delight, consider these delicious accompaniments to elevate your dessert experience.

Vanilla Ice Cream: A classic pairing that contrasts the cake’s richness, offering a creamy, cold balance to each indulgent bite.
Fresh Berries: Juicy raspberries or strawberries brighten the plate with a pop of color and tartness, enhancing the chocolate flavor beautifully.
Whipped Cream: Light and airy, a dollop of freshly whipped cream adds a luxurious touch that makes every slice even more irresistible.
Chocolate Ganache: For an extra chocolatey twist, drizzling warm ganache provides an indulgent layer of smooth richness that’s simply divine.
Coffee or Espresso: A warm cup of coffee enhances the deep chocolate notes of the cake, creating a harmonious flavor pairing perfect for any gathering.
Caramel Sauce: A drizzle of caramel adds a sweet and salty element that pairs wonderfully with the chocolate, creating an unforgettable dessert experience.
Toasted Nuts: Crushed walnuts or pecans sprinkled on top introduce a satisfying crunch and earthy flavor, creating a delightful textural contrast.
Mint Leaves: Fresh mint not only adds a burst of color but also a refreshing note that cuts through the richness of the chocolate.
Chocolate Dipped Strawberries: For a touch of decadence, serve chocolate-covered strawberries on the side for a fun and fancy presentation.

Make Ahead Options

This moist chocolate sheet cake is perfect for meal prep, allowing you to enjoy delicious homemade dessert with ease. You can prepare the cake up to 24 hours in advance by baking it and allowing it to cool completely. Once cooled, wrap it tightly with plastic wrap to maintain its moisture. The frosting can also be made ahead and stored in an airtight container in the refrigerator for up to 3 days; just give it a quick stir before spreading. When you’re ready to serve, simply frost the cake and cut it into slices for an effortless, crowd-pleasing treat that tastes just as great as when freshly made!

Expert Tips for Moist Chocolate Sheet Cake

Mix Gently: Stir the batter until just combined; overmixing can lead to a dense cake. Trust that your moist chocolate sheet cake will rise beautifully with less effort!
Ingredient Temperature: Ensure all wet ingredients are at room temperature for better blending and a fluffier texture. Cold ingredients can lead to a less uniform batter.
Check Doneness: Use a toothpick to test the cake, aiming for a few moist crumbs sticking to it, not wet batter. This ensures that your cake remains moist and tender.
Frost When Cool: Allow your cake to cool completely before frosting. This prevents the icing from melting and maintains that rich, luscious texture.
Store Wisely: Keep your cake in an airtight container at room temperature for up to 5 days for the best taste and texture. Refrigerate if you need it to last longer!

Moist Chocolate Sheet Cake Recipe FAQs

What type of flour should I use for the best texture?
For the best results, use all-purpose flour, which provides the ideal structure for your moist chocolate sheet cake. If you need a gluten-free version, a gluten-free flour blend can be an excellent substitute, ensuring that your cake remains just as delicious and moist.

How should I store the cake after baking?
To keep your cake fresh, store the frosted cake in an airtight container at room temperature for up to 3 days. If you want it to last longer, refrigerate it for up to 5 days. Just make sure it’s covered well to prevent it from drying out!

Can I freeze the moist chocolate sheet cake?
Absolutely! The unfrosted cake can be frozen for up to 3 months. To do this, tightly wrap the cooled cake in plastic wrap and then in foil. When you’re ready to enjoy it, simply thaw it overnight in the fridge and frost it before serving for that freshly baked taste.

What if my cake turns out too dense?
If your cake is dense, it may be due to overmixing the batter. It’s crucial to stir until just combined, as overmixing can lead to a heavier texture. Additionally, double-check that your baking soda and baking powder are fresh; stale leavening agents can also affect how well your cake rises.

Can I use substitutions for eggs or dairy?
Yes! If you’re looking for alternatives, you can use flax eggs (1 tablespoon ground flaxseed mixed with 2.5 tablespoons water per egg) to make this recipe vegan. For traditional dairy substitutes, unsweetened applesauce can replace sour cream, while a mix of milk with vinegar or lemon juice works well instead of buttermilk.