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A freshly baked marble half sheet cake with a beautiful chocolate and vanilla swirl, topped with chocolate ganache and displayed on a white cake stand.
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Marble Half Sheet Cake

This Marble Half Sheet Cake is a stunning blend of rich chocolate and vanilla flavors, swirled together for a beautiful marbled effect. Perfect for birthdays, parties, and special occasions, this moist and fluffy cake serves a crowd and is easy to customize with your favorite frosting. Whether you're a beginner or an experienced baker, this step-by-step recipe will help you create a delicious and eye-catching dessert from scratch!
Prep Time20 minutes
Cook Time35 minutes
Total Time55 minutes
Course: Dessert
Cuisine: American
Servings: 20 servings
Calories: 350kcal

Ingredients

  • 2 ½ cups cake flour
  • 2 teaspoons baking powder
  • ½ cup unsweetened cocoa powder
  • 1 cup butter (softened)
  • 1 ½ cups sugar
  • 4 large eggs
  • 1 teaspoon vanilla extract
  • 1 cup whole milk

Instructions

  • Preheat the oven to 350°F (175°C) and prepare a 13x18-inch half sheet pan.
  • Mix together the dry ingredients for the vanilla batter and set aside.
  • Cream together butter and sugar in a separate bowl, then add eggs and vanilla extract.
  • Add the dry ingredients alternately with milk, mixing until smooth.
  • Divide the batter into two bowls, and mix cocoa powder into one half to make the chocolate batter.
  • Spoon the batters alternately into the prepared pan and swirl with a knife or skewer.
  • Bake for 30-35 minutes until a toothpick comes out clean.
  • Allow the cake to cool, frost, and decorate as desired.