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–+ servings
A moist slice of dark chocolate Easy Snacking Sheet Cake topped with glossy chocolate frosting on a white plate.

Easy Snacking Sheet Cake (Last-Minute)

This easy sheet cake is perfect for last-minute cravings or unexpected guests. It comes together quickly and is topped with a simple chocolate frosting.
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Prep Time 15 minutes
Cook Time 25 minutes
Cooling Time 30 minutes
Total Time 1 hour 10 minutes
Servings: 12 pieces
Course: Dessert
Cuisine: American
Calories: 418
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Cake
  • 1 cup butter, cubed
  • 1 cup water
  • 1/4 cup baking cocoa
  • 2 cups all-purpose flour
  • 2 cups sugar
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 cup sour cream
For the Icing
  • 1/2 cup butter, cubed
  • 1/4 cup plus 2 tablespoons 2% milk
  • 3 tablespoons baking cocoa
  • 3-3/4 cups confectioners' sugar
  • 1 teaspoon vanilla extract

Equipment

  • Large saucepan
  • 15x10x1-in. baking pan
  • small saucepan
  • Wire rack

Method
 

  1. In a large saucepan, bring the butter, water, and cocoa to a boil. Remove from heat.
  2. Combine the flour, sugar, baking soda, and salt. Add this mixture to the cocoa mixture. Stir in the sour cream until smooth.
  3. Pour the batter into a greased 15x10x1-inch baking pan. Bake at 350°F (175°C) for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
  4. While the cake bakes, prepare the icing. In a small saucepan, melt the butter. Add the milk and cocoa. Bring to a boil, then remove from heat.
  5. Whisk in the confectioners' sugar and vanilla extract until smooth. Pour the warm icing over the warm cake.
  6. Cool the cake completely on a wire rack before serving.

Nutrition

Calories: 418kcalCarbohydrates: 72gProtein: 3gFat: 14gSaturated Fat: 9gCholesterol: 35mgSodium: 266mgFiber: 1gSugar: 57g

Notes

This cake is designed for quick preparation and can be enjoyed plain or with simple toppings like sprinkles or whipped cream.

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