Moist, buttery pound cake swirled with chocolate and vanilla batters, enriched with tangy buttermilk for a tender crumb and beautiful marble design.
1 cup (2 sticks) unsalted butter, room temp
1¾ cups granulated sugar
4 large eggs
2 tsp vanilla extract
3 cups all-purpose flour
½ tsp baking soda
½ tsp salt
1 cup buttermilk
¼ cup unsweetened cocoa powder
1–2 tbsp buttermilk (for cocoa batter)
Preheat oven to 325°F. Grease and flour a 9×5 loaf or bundt pan.
Cream butter and sugar until light and fluffy, 3–5 mins.
Beat in eggs one at a time, then add vanilla.
In a separate bowl, whisk flour, baking soda, and salt.
Alternate adding flour mixture and buttermilk, starting and ending with flour.
Transfer 1½ cups of batter to a separate bowl. Stir in cocoa and extra buttermilk to loosen.
Layer vanilla and chocolate batters in the pan. Swirl gently with a knife.
Bake 60–70 minutes, or until toothpick comes out with moist crumbs.
Cool 15 minutes in pan, then transfer to a wire rack to cool completely.
Use real buttermilk for best texture. Swirl gently for a clean marble pattern. Store at room temp up to 4 days.