Tulo

Loaf with a Chocolate Swirl

A sliced vanilla loaf cake on a wooden board showing a marbled dark chocolate swirl running through the pale crumb.
Photo by hamzaoui fatma on Pexels

Splitting off part of the plain batter and stirring in cocoa powder and a little extra milk keeps the chocolate portion loose enough to swirl cleanly instead of sinking to the bottom, so every slice shows a distinct marbled pattern rather than a single chocolate layer.

Prep
20 min
Cook
55 min
Total
75 min
Servings
10

Ingredients

Servings10
  • 2 cups all-purpose flour
  • 1 cup granulated sugar
  • 2 tsp baking powder
  • 1/2 tsp salt
  • 2 large large eggs
  • 1/2 cup unsalted butter, melted
  • 3/4 cup whole milk
  • 1 tsp vanilla extract
  • 1/3 cup unsweetened cocoa powder
  • 1/4 cup granulated sugar, for the chocolate swirl
  • 2 tbsp whole milk, to loosen the swirl

Nutrition per serving

Calories
305
Protein
5g
Carbs
47g
Fat
11g

Based on the recipe as written, one serving. Recalculates if you swap an ingredient above. An estimate only, exact values depend on the specific ingredients used.

Need different units or a different yield? Try our Conversion Calculator →

Instructions

  1. 1Preheat the oven to 350°F (175°C). Grease a 9x5-inch loaf pan and line it with a strip of parchment paper for easy removal.
  2. 2In a large bowl, whisk together the flour, 1 cup sugar, baking powder, and salt.
  3. 3In a separate bowl, whisk the eggs, melted butter, milk, and vanilla until smooth.
  4. 4Pour the wet ingredients into the dry ingredients and stir with a spatula until just combined and no streaks of flour remain; the batter will be thick.
  5. 5Scoop out about 1.5 cups of the plain batter into a small bowl. Whisk in the cocoa powder, 1/4 cup sugar, and the 2 tablespoons of milk until smooth and pourable.
  6. 6Spoon half the plain batter into the prepared pan in dollops, then spoon half the chocolate batter over it in dollops. Repeat with the remaining plain and chocolate batter.
  7. 7Drag a butter knife or skewer through the batter in a zigzag or figure-eight pattern, making 5 to 6 passes down the length of the pan, to marble the two batters without fully blending them.
  8. 8Bake for 50 to 60 minutes, until a toothpick inserted in the thickest part of the loaf comes out with a few moist crumbs clinging to it, not wet batter.
  9. 9Cool the loaf in the pan for 15 minutes, then turn it out onto a wire rack and cool completely, at least 1 hour, before slicing.

Tips & variations

  • For a sharper marble, chill the chocolate batter for 10 minutes before layering so it holds its shape against the plain batter instead of spreading immediately.
  • Stir 1/3 cup mini chocolate chips into the plain batter for extra pockets of melted chocolate alongside the swirl.
  • A tablespoon of espresso powder added to the chocolate portion deepens the cocoa flavor without making the loaf taste like coffee.
  • If the top is browning too quickly before the center sets, tent the pan loosely with foil for the last 15 minutes of baking.

Storage & reheating

Store the cooled loaf wrapped tightly in plastic wrap at room temperature for up to 4 days, or refrigerate for up to a week. Freeze whole or sliced, wrapped in plastic wrap and then foil, for up to 3 months; thaw at room temperature or warm individual slices for 10-15 seconds in the microwave.

Tips from the Tulo kitchen

  • Weighing the flour instead of scooping with a measuring cup prevents a dense loaf; scooped flour can pack in 20-30% more than a level, spooned-and-swept cup.
  • Letting the eggs, butter, and milk come to room temperature before mixing helps the batter come together evenly, since this one-bowl method has no creaming step to smooth out cold lumps.

FAQ

Why did the chocolate swirl sink to the bottom of the loaf?

The chocolate batter was likely too thin or too heavy relative to the plain batter. Make sure the extra milk is measured exactly, and layer the two batters in alternating dollops rather than pouring the chocolate batter in as one heavy pool.

Can this loaf be made ahead?

Yes. It keeps its texture well for several days wrapped at room temperature, and the flavor is actually more pronounced the day after baking once the loaf has fully cooled and set.

Can natural cocoa powder be swapped for Dutch-process?

Yes, either works here since the recipe uses baking powder rather than baking soda, which means it doesn't depend on natural cocoa's acidity to leaven the batter.

Why is the loaf dense instead of light and tender?

Overmixing after the flour is added is the most common cause; stir only until the streaks of flour disappear, since continued stirring develops gluten and toughens the crumb.