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Marble Sheet Cake with Double Chocolate Buttercream

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  • Prep 30 min
  • Total 2 hr 0 min
  • Servings 24
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It turns out “chocolate or vanilla?” is a trick question, because the answer is both -- and this homemade marble sheet cake is the proof. We promise this cake is as easy as it is pretty.
Updated Jun 30, 2017
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Ingredients

Cake

  • 2 cups Gold Medal™ all-purpose flour
  • 1 teaspoon baking powder
  • 1/4 teaspoon salt
  • 1 cup butter, softened
  • 1 1/2 cups granulated sugar
  • 3 eggs
  • 2 teaspoons vanilla
  • 1 cup milk
  • 3 tablespoons unsweetened baking cocoa
  • 1/8 teaspoon baking soda

Frosting

  • 1/2 cup semisweet chocolate chips
  • 1 cup butter, softened
  • 2 1/4 cups powdered sugar
  • 1/4 cup unsweetened baking cocoa
  • 2 tablespoons milk
  • 1 teaspoon vanilla

Steps

  • 1
    Heat oven to 350°F. Spray bottom and sides of 15x10x1-inch pan with cooking spray. In small bowl, mix flour, baking powder and salt; set aside.
  • 2
    In large bowl, beat 1 cup softened butter and the granulated sugar with electric mixer on medium speed 2 minutes, scraping bowl occasionally, until fluffy. Beat in eggs, one at a time, just until smooth. Beat in 2 teaspoons vanilla. On low speed, beat in one-third of the flour mixture, then half of the milk, beating well after each addition, just until smooth. Repeat with flour mixture and milk, ending with flour mixture, scraping side of bowl occasionally. Spread 4 cups vanilla batter evenly in pan.
  • 3
    To remaining batter, beat in 3 tablespoons baking cocoa and the baking soda with spoon until well blended. Spoon chocolate batter by generous tablespoonfuls evenly onto vanilla batter. Cut through mixture several times with knife for marbled design. Tap pan on counter 2 or 3 times to eliminate air bubbles from batter.
  • 4
    Bake 25 to 30 minutes or until toothpick inserted in center comes out clean. Cool completely, about 1 hour.
  • 5
    In medium microwavable bowl, microwave chocolate chips uncovered on High 60 to 90 seconds; stir until smooth. Cool 5 minutes. Add remaining Frosting ingredients to bowl, and beat with electric mixer on medium speed until smooth and creamy, scraping side of bowl occasionally. Spread on top of cake. To serve, cut into 6 rows by 4 rows. Store loosely covered at room temperature.

Expert Tips

  • tip 1
    Measure ingredients accurately, and add them in the order listed in the recipe to ensure success.
  • tip 2
    To soften butter, cut in small pieces, and leave at room temperature. A faster method is to microwave butter in 5-second intervals, turning frequently so butter is softened but not melted.

Nutrition Information

310 Calories, 18g Total Fat, 3g Protein, 36g Total Carbohydrate, 26g Sugars

Nutrition Facts

Serving Size: 1 Serving
Calories
310
Calories from Fat
160
Total Fat
18g
27%
Saturated Fat
11g
54%
Trans Fat
1/2g
Cholesterol
65mg
22%
Sodium
190mg
8%
Potassium
80mg
2%
Total Carbohydrate
36g
12%
Dietary Fiber
1g
4%
Sugars
26g
Protein
3g
% Daily Value*:
Vitamin A
10%
10%
Vitamin C
0%
0%
Calcium
4%
4%
Iron
6%
6%
Exchanges:
1 Starch; 0 Fruit; 1 1/2 Other Carbohydrate; 0 Skim Milk; 0 Low-Fat Milk; 0 Milk; 0 Vegetable; 0 Very Lean Meat; 0 Lean Meat; 0 High-Fat Meat; 3 1/2 Fat;
Carbohydrate Choice
2 1/2
*Percent Daily Values are based on a 2,000 calorie diet.
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