How do I make my Chocolate Sheet Cake extra moist?

The secret to an incredibly moist Chocolate Sheet Cake is using ingredients like sour cream, vegetable oil, and hot coffee. The sour cream adds richness, the oil keeps it tender, and the coffee deepens the chocolate flavor. Be sure not to overbake — once a toothpick comes out clean, take it out of the oven right away.

Can I make this Chocolate Sheet Cake ahead of time?

Yes! You can bake it a day in advance. Let it cool completely, then cover tightly with plastic wrap or foil. I recommend frosting it the next day before serving for the freshest flavor and texture.

Can I use hot water instead of coffee?

Definitely. While coffee enhances the chocolate flavor, it doesn’t make the cake taste like coffee. If you prefer, use hot water instead — the cake will still be rich, soft, and delicious.

What kind of cocoa powder works best?

I recommend using Dutch-process cocoa powder because it gives a deep, smooth chocolate taste. However, natural unsweetened cocoa works too — your cake will just have a slightly lighter color and tangier flavor.

Chocolate Sheet Cake Perfect Homemade Treat

Description

This Chocolate Sheet Cake is rich, moist, and easy to make — the perfect nostalgic dessert for birthdays, potlucks, or casual weeknight treats. No fancy tools required — just big flavor and simple ingredients.

Ingredients

Scale

For the Cake:
3 ¼ cups all-purpose flour
2 cups granulated sugar
1 cup dark brown sugar
1 ¼ cups Dutch-process cocoa powder
2 ½ teaspoons baking powder
2 teaspoons baking soda
2 teaspoons espresso powder
1 ½ teaspoons kosher salt
1 ½ cups full-fat sour cream
¾ cup vegetable oil
4 large eggs
½ cup buttermilk
1 ½ tablespoons apple cider vinegar
1 teaspoon vanilla extract
1 ½ cups strong hot coffee or boiling water
2 tablespoons softened butter (for greasing the pan)
For the Frosting:
⅓ cup unsalted butter
⅓ cup sour cream
1 ¼ cups granulated sugar
1 tablespoon Dutch-process cocoa powder
1 teaspoon vanilla extract
1 cup dark chocolate chips
A pinch of salt

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Instructions

Preheat oven to 350°F. Grease a half-sheet pan (about 18.5 by 13.5 inches) with softened butter. If your pan has 1-inch sides, be careful not to overfill.
In a large bowl, whisk together flour, sugars, cocoa powder, baking powder, baking soda, espresso powder, and salt.
In another bowl, combine sour cream, vegetable oil, eggs, buttermilk, vinegar, and vanilla. Whisk until smooth.
Pour the wet ingredients into the dry and mix until just combined. Slowly add hot coffee and stir until the batter is smooth and shiny.
Pour batter into the prepared sheet pan. Bake for 18–20 minutes, or until a toothpick inserted in the center comes out clean. Do not overbake.
For the frosting: Melt butter, sour cream, and sugar in a saucepan over medium-high heat. Let it boil for 30 seconds, then remove from heat.
Whisk in cocoa powder, vanilla, chocolate chips, and salt until glossy and smooth.
Pour the warm frosting over the warm (not hot) cake. Spread evenly and let cool completely before slicing.

Notes

Store covered at room temperature for up to 3 days or in the fridge for up to 5 days. Unfrosted slices freeze well — wrap individually and thaw before frosting. Double the frosting if you love an extra thick layer!

Prep Time: 25 minutes
Cook Time: 20 minutes
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 slice
Calories: 390
Sugar: 31g
Sodium: 260mg
Fat: 19g
Saturated Fat: 8g
Unsaturated Fat: 10g
Trans Fat: 0g
Carbohydrates: 52g
Fiber: 3g
Protein: 5g
Cholesterol: 50mg