
Yields:
10 - 12 serving(s)
Prep Time:
45 mins
Total Time:
2 hrs 30 mins
Can't seem to choose between chocolate and vanilla? Bake this marble Bundt cake and you don't have to! With swirls of rich chocolate and moist vanilla cakes intertwined, this stunning scratch-made cake has something for everyone. The best part? You only need to make one batch of batter! This chocolaty treat is finished with a sweet and tangy buttermilk glaze that pairs perfectly with the rich cake. Get ready to slice into this beauty and have everyone say "wow!"
How do you make a marble cake?
This easy cake is made with one batter that you simply split in half. One half is left plain. The other is transformed by adding rich cocoa powder, bittersweet chocolate, and a little water. Dollop the vanilla and chocolate batters into a prepared Bundt pan and gently swirl them together with a butter knife. The combined mixtures bake up into a beautiful sweet cake that offers the best of both worlds.
Why make a cake with both butter and oil?
Cakes are typically made with either butter or oil, but using both yields a cake that is tender, flavorful, and perfectly moist. Creamed butter adds delicious flavor and also creates a thick batter, which is ideal for swirling. Bundt cakes require a longer baking time than flat cake rounds and sheet cakes. The inclusion of vegetable oil helps keep the cake from drying out, both in the oven and while it sits on your countertop—though it won't last there long!
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Ingredients
For the cake:
Baking spray with flour, for the pan
- 1/3 cup
unsweetened cocoa powder
- 2 oz.
bittersweet (60%) chocolate, finely chopped
- 3 cups
all-purpose flour
- 2 tsp.
baking powder
- 1 cup
(2 sticks) salted butter, at room temperature
- 2 1/2 cups
granulated sugar
- 1/4 cup
vegetable oil
- 1 Tbsp.
vanilla extract
- 5
large eggs, at room temperature
- 1 cup
buttermilk, at room temperature
For the glaze:
- 2 1/2 cups
powdered sugar, plus more as needed
- 3 Tbsp.
salted butter, melted
- 3 Tbsp.
buttermilk, plus more as needed
- 1/2 tsp.
vanilla extract
Directions
- Step 1For the cake: Preheat the oven to 350°F. Spray a 10- to 12-cup Bundt pan with baking spray.
- Step 2In a small saucepan, simmer ½ cup water over medium heat. Whisk in the cocoa powder and remove from the heat. Add the chopped chocolate and allow to sit for 30 seconds before stirring until melted and well combined. Set aside.
- Step 3In a medium bowl, whisk together the flour and baking powder.
- Step 4To the bowl of a stand mixer fitted with the paddle attachment, add the butter and granulated sugar. Beat on low speed until just combined. Increase the speed to medium-high and beat, stopping to scrape the sides and bottom of the bowl occasionally, until light and fluffy, 4 to 6 minutes. Decrease the speed to medium-low and beat in the oil and vanilla. Beat in the eggs, one at a time, until well combined, stopping to scrape the sides and bottom of the bowl as needed.
- Step 5Decrease the speed to low and gradually add the flour mixture in 3 parts, alternating with the buttermilk, mixing until just combined after each addition. Remove the bowl from the mixer and stir the batter once more with a rubber spatula.
- Step 6Transfer half of the batter (about 4 cups) to a large bowl. Pour the chocolate mixture over the remaining batter in the mixer bowl and stir well to combine.
- Step 7Using 2 cookie scoops or large spoons, dollop alternating scoops of plain and chocolate batter in a random pattern in the bottom of the prepared Bundt pan. Continue alternating the batters until the batters are used up. Use a butter knife to gently swirl the batters in a figure 8 motion, making sure not to scrape the bottom or sides of the pan. On a kitchen towel-lined countertop, firmly tap the pan a few times to settle the batter and release any air bubbles.
- Step 8Bake until set, golden, and a toothpick inserted in the center comes out with a few moist crumbs, 55 minutes to 1 hour 5 minutes.
- Step 9Let the cake cool for 10 minutes in the pan before carefully flipping it out onto a wire cooling rack; let cool completely.
- Step 10For the glaze: In a medium bowl, whisk together the powdered sugar, butter, buttermilk, and vanilla. Add additional powdered sugar, 1 tablespoon at a time, or more buttermilk, 1 teaspoon at a time, until a thick, pourable consistency is reached.
- Step 11Place the cake on a serving platter and spoon or pour the glaze on top of the cake, allowing it to drip down the sides. Allow the glaze to set for about 20 minutes before slicing and serving.
Tip: The cake will keep for up to 5 days wrapped in plastic or stored in an airtight container at room temperature.
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