
This incredibly moist One Bowl Chocolate Cake comes together in minutes with just one bowl and pantry staples. Rich, fudgy, and topped with silky chocolate frosting, it is the only chocolate cake recipe you will ever need.

Some recipes earn a permanent spot in your kitchen, and this One Bowl Chocolate Cake is exactly that kind of recipe. It is deeply chocolatey, impossibly moist, and comes together so easily that you will find yourself making it for birthdays, last-minute gatherings, and quiet Tuesday nights when you simply need a great piece of cake.
The best part? You need exactly one bowl. No creaming butter, no alternating wet and dry ingredients in separate vessels, no complicated technique. Just one bowl, a whisk, and about 15 minutes of your time before the oven does the rest.
The secret to this cake's incredible texture is the combination of oil instead of butter in the batter and a full cup of hot coffee poured in at the end. Oil keeps cakes moist for days (no dry crumbs here), and the hot coffee blooms the cocoa powder, coaxing out a rich, complex chocolate flavor that you simply cannot get any other way.
Do not worry, the cake does not taste like coffee. It tastes like the best chocolate cake you have ever had.
The other hero ingredient is buttermilk. Its gentle acidity tenderizes the gluten in the flour, giving you a soft, fine crumb that practically melts on your tongue. If you bake chocolate cake regularly, keeping a carton of buttermilk in your refrigerator is one of the best habits you can form.
Chef's Tip: Use Dutch-process cocoa powder if you can find it. It has a smoother, less acidic flavor and gives the cake a beautiful deep color. Natural cocoa works too, but Dutch-process takes this recipe from great to extraordinary.
For a one-bowl cake, the tools you use really do matter. A good whisk makes combining the batter effortless, and a quality offset spatula turns frosting into a satisfying experience rather than a frustrating one.
Tools & Ingredients We Recommend
This cake is paired with a classic chocolate buttercream that strikes the perfect balance. It is rich and creamy without being cloying, and it spreads like a dream.
The key to a great buttercream is patience. Beat your butter until it is truly pale and fluffy before adding anything else. This takes a full 3 minutes with a mixer and it is not a step to rush. That whipped butter base is what gives the frosting its light, pillowy texture.
A few tips for frosting success:
Even a simple recipe has a few moments worth paying attention to. Here is what separates a good chocolate cake from a truly great one:
Ready to bake? Here is everything you need:

This incredibly moist One Bowl Chocolate Cake comes together in minutes with just one bowl and pantry staples. Rich, fudgy, and topped with silky chocolate frosting, it is the only chocolate cake recipe you will ever need.
Preheat your oven to 350 degrees F (175 degrees C). Grease two 9-inch round cake pans and line the bottoms with parchment paper.
In one large bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt until evenly combined.
Add the eggs, buttermilk, vegetable oil, and vanilla extract directly to the dry ingredients. Whisk until a smooth, thick batter forms.
Pour in the hot coffee or boiling water and whisk until the batter is fully combined. It will be thin. This is normal and makes for an incredibly moist cake.
Divide the batter evenly between the two prepared pans. Bake for 30 to 35 minutes, or until a toothpick inserted in the center comes out clean.
Let the cakes cool in their pans on a wire rack for 15 minutes, then turn them out and allow them to cool completely before frosting.
To make the frosting, beat the softened butter with a hand or stand mixer on medium speed until pale and fluffy, about 3 minutes.
Add the sifted cocoa powder and mix on low until incorporated. Gradually add the powdered sugar, one cup at a time, alternating with splashes of heavy cream, beating well after each addition.
Add the vanilla extract and beat on medium-high for 2 minutes until the frosting is light and fluffy. Add more cream, one tablespoon at a time, if needed to reach a spreadable consistency.
Place one cake layer on your serving plate. Spread a generous layer of frosting on top. Place the second layer on top and frost the top and sides of the entire cake. Slice and serve.
This cake is stunning as a classic two-layer round cake, but it is also wonderful baked as a 9x13 sheet cake if you want something simpler to serve at a party. Just adjust the baking time slightly, checking for doneness starting at 35 minutes.
Leftover cake keeps beautifully covered at room temperature for 2 days, or in the refrigerator for up to 5 days. If you store it in the fridge, let each slice come to room temperature before eating. Cold butter in the frosting firms up considerably, and this cake deserves to be enjoyed at its softest, most fudgy best.