Vanilla and chocolate batters are swirled together before baking to create the signature marbled pattern in this classic cake. The technique is straightforward — two simple batters, one pan, and a few passes with a skewer. From start to finish, expect about 1 hour and 15 minutes.
Prepare the Batter: Preheat your oven to 350°F (175°C). Grease and flour a 9-inch loaf pan. In a mixing bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
Cream the Butter and Sugar: In a separate bowl, using a hand mixer or stand mixer, beat the softened butter and sugar together on medium speed until light and fluffy, about 4 minutes. The mixture should turn a pale yellow.
Incorporate the Eggs and Vanilla: Add the eggs one at a time to the butter mixture, ensuring each is fully incorporated before adding the next. Mix in the vanilla extract.
Combine Dry Ingredients and Milk: Alternating between the two, add the flour mixture and the room temperature milk to the butter mixture. Begin and end with the flour mixture, mixing just until combined.
Create the Chocolate Swirl: Transfer half of the batter into a separate bowl. Stir in the cocoa powder until fully mixed. Pour half of the vanilla batter into the prepared loaf pan, followed by the chocolate batter, and then the remaining vanilla batter. Use a rubber spatula to swirl the batters together, creating the marble effect.
Bake the Cake: Bake for 60 minutes, or until a toothpick inserted in the center comes out clean. Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack to cool completely.
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Notes
Consider using a high-quality cocoa powder for a richer chocolate flavor.
For a twist, add a teaspoon of espresso powder to the chocolate batter to enhance the chocolate aroma.