Hot Chocolate Marble Cake

This swirly pound cake is the perfect place to use leftover hot chocolate mix. Fold in 1/2 cup of chocolate chips if you want a little more chocolate.
  • 2 sticks (16 tablespoons) unsalted butter, at room temperature, plus more for the pan
  • 1 3/4 cups plain flour
  • 1/2 teaspoon fine salt
  • 4 large eggs, at room temperature
  • 2 tablespoons sour cream
  • 1 teaspoon pure vanilla extract
  • 1 1/4 cups sugar
  • 1/2 cup hot chocolate or cocoa mix

Special equipment: a 9-by-5-inch loaf pan.

Position a rack in the lower third of the oven, and preheat to 160°C. Butter a 9-by-5-inch loaf pan.

Sift the flour and salt into a medium bowl. Whisk together the eggs, sour cream and vanilla in a small bowl.

Beat the butter in a large bowl with an electric mixer on medium-high speed until smooth. Gradually add the sugar, 1/4 cup at a time, to cream and lighten the butter.

Continue to beat the butter mixture until light and fluffy, about 5 minutes. Scrape down the bowl as needed.

Reduce the mixer speed to low. Beat in the flour, 1/4 cup at a time, then beat the batter for 30 seconds. Gradually beat in the egg mixture. (Take care not to overmix.)

Transfer about 1/3 of the batter to a medium bowl, and stir in the hot chocolate mix. Spoon 1/2 the remaining vanilla batter into the prepared loaf pan, and smooth over the top with a spatula. Using 1/2 the hot chocolate batter, drop spoonfuls on top of the vanilla batter. Repeat with the remaining vanilla and hot chocolate batters. Run a skewer through the loaf pan to help swirl the 2 batters together. Tap the pan on the counter.

Bake until a toothpick inserted in the center comes out clean and the top springs back when lightly pressed, 1 hour to 1 hour and 30 minutes.

Let the cake cool in the pan for a few minutes, then invert and let cool completely on a rack.

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For best results, don't use hot chocolate or cocoa mixes that contain powdered milk or other dairy products, which can change the structure and texture of the cake.

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