Decadent Chocolate Orange Cake Recipe for Irresistible Flavor

This easy chocolate orange cake combines bright citrus and deep chocolate in a moist, fudgy single-layer cake. Made with fresh orange juice, orange zest, and buttermilk, it delivers a lively, well-balanced flavor.

The cake is finished with swirls of a quick chocolate-orange ganache and decorated with chocolate-dipped dried orange slices for a beautiful, minimal-fuss dessert that highlights both chocolate and citrus.

I developed this chocolate orange cake after making a chocolate orange cheesecake earlier in the year. Instead of a multi-layer or elaborate design, I wanted a simple single-layer cake that would be quick to assemble while still showcasing bold chocolate and citrus flavors.

The cake batter is adapted from a dense, moist chocolate olive oil cake to achieve a fudgy texture and deep chocolate taste. Using Dutch-process cocoa and a portion of black cocoa yields a richer flavor and dramatic dark color. Generous orange zest and fresh orange juice ensure a lively citrus note throughout.

The finished cake is tender and moist with a pronounced orange character and rich chocolate crumb. A straightforward ganache made with full-fat sour cream and dark chocolate is stirred with finely grated orange zest and swirled over the cooled cake. For garnish, chocolate-dipped dried orange slices add a festive, textural contrast.

This chocolate orange cake is ideal for holidays, dinner parties, or any occasion when you want an elegant but easy dessert that balances bright citrus and decadent chocolate.

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Ingredients

* See the recipe card below for the full ingredient quantities and metric/US conversions.

FOR THE CAKE

Dutch-process cocoa powder – chosen for its darker color and rounded chocolate flavor. Avoid replacing with natural cocoa without adjusting other ingredients.

Black cocoa powder – optional but adds an extra-deep color and a slightly toasted, cookie-like note. Substitute with Dutch-process cocoa if unavailable.

Vegetable oil – any neutral oil such as grapeseed, avocado, or canola will work.

Eggs – use large, room-temperature eggs for best structure and emulsification.

Buttermilk – its acidity tenderizes the crumb and complements the orange flavor.

Orange zest – zest from a navel orange gives an immediate citrus lift.

Orange juice – freshly squeezed is best; plan on about three medium oranges for the required amount.

FOR THE EASY GANACHE

Sour cream – full-fat sour cream creates a smooth ganache without heavy cream.

Orange zest – finely chopped after grating so it blends into the frosting without noticeable texture.

Dark chocolate – a bar around 50–72% cacao melts smoothly and balances the citrus; 72% works well here.

FOR DECORATION

Chocolate-dipped dried orange slices make a striking, flavorful topping for the frosted cake.

Substitutions

Black cocoa powder – If you can’t find black cocoa, replace it with an equal amount of Dutch-process cocoa. The cake will be slightly less dramatic in color but retain a rich chocolate flavor.

Sour cream – You can swap full-fat sour cream in the ganache for an equal amount of full-fat Greek yogurt or crème fraîche for a similar texture and tang.

Equipment

8-inch round cake pan (8 x 3 inch) — a heavy-duty pan gives even baking and a tidy crumb.

Small offset spatula — helpful for spreading the ganache and creating the finished swirls.

Storage

Leave the frosted cake at room temperature for up to 2–3 hours. After that, store in an airtight container in the refrigerator for up to 3 days because the ganache contains sour cream. Allow the cake to come to room temperature before serving for the best texture and flavor.

To freeze, wrap the unfrosted or frosted cake tightly in plastic wrap and place in an airtight container for up to 2 months. Thaw in the refrigerator, then bring to room temperature before serving.

Recipe Tips

Ensure the cake is completely cool before applying the ganache so the frosting sets properly and doesn’t slide.

Spread the ganache while it’s still soft; it will thicken as it cools and becomes harder to smooth. If it becomes too firm, warm the ganache gently in a heatproof bowl set over a pan of hot water and stir until spreadable.

📖 Recipe

Chocolate Orange Cake

An easy single-layer chocolate cake infused with fresh orange juice and zest, finished with a quick sour-cream chocolate ganache. Bright, fudgy, and simple to prepare.

AuthorKathleen Culver

Prep time30 minutes

Cook time40 minutes

Cool time1 hour

Total time2 hours 10 minutes

Servings12 slices (1 layer 8 inch cake)

INGREDIENTS

Metric – US

Chocolate Orange Cake

• 150 grams all purpose flour
• 52 grams Dutch-process cocoa powder
• 32 grams black cocoa powder
• ½ teaspoon kosher salt
• 1½ teaspoons baking powder
• 83 mL vegetable oil
• 200 grams granulated sugar
• 2 large eggs
• 187 mL buttermilk
• orange zest, from 1 navel orange
• 7.5 mL vanilla extract
• 187 mL orange juice, freshly squeezed

Chocolate orange ganache

• 240 grams sour cream, full fat
• orange zest, from 1 navel orange, finely chopped
• 200 grams dark chocolate, finely chopped (50–72% cacao)

Dried orange decoration

• dried orange slices, (see dried orange slices recipe)

INSTRUCTIONS

Chocolate orange cake

• Preheat the oven to 350°F (177°C). Position a rack in the center.
• Line the base of an 8-inch by 3-inch cake pan with parchment and grease the sides.
• Whisk together the flour, cocoa powders, salt, and baking powder in a medium bowl; set aside.
• In a large bowl, whisk oil and granulated sugar. Add eggs one at a time, beating well after each addition.
• Stir in the buttermilk, orange zest, and vanilla until combined.
• Add one-third of the dry ingredients and mix, then pour in half the orange juice and combine. Alternate adding the remaining dry ingredients and orange juice, finishing with the dry ingredients. Whisk until smooth and pour into the prepared pan.
• Bake for 40–45 minutes, or until the top springs back lightly and a toothpick comes out with a few moist crumbs (not wet batter). Avoid overbaking. Cool in the pan for 10 minutes, then invert onto a rack to finish cooling.

Chocolate orange ganache

• Place sour cream and finely chopped orange zest in a bowl and whisk to combine. Set aside while you melt the chocolate.
• Melt the chopped dark chocolate in a microwave in 30-second bursts, stirring between each, until smooth. Alternatively, melt over a double boiler.
• Add the melted chocolate to the sour cream, whisking gently until fully incorporated. Scrape the bowl to ensure no streaks remain. Scoop the ganache onto the cooled cake and spread to the edges, creating swirls with a small offset spatula or the back of a spoon. Top with chocolate-dipped dried orange slices if desired.

EQUIPMENT

• 8-inch round cake pan
• Small offset spatula

NOTES

Cake

• Using some black cocoa adds dramatic color and a slightly different chocolate character. If you don’t have it, swap with equal Dutch-process cocoa.
• This cake is intentionally moist and fudgy. Test for doneness at 40 minutes; the toothpick should have a few moist crumbs but not raw batter.

Ganache

• Allow the cake to cool fully before adding the ganache so it sets properly.
• Spread the ganache while it’s still soft for easy smoothing; it will thicken as it cools.
• If the ganache becomes too thick, warm it gently over hot water and stir until spreadable.