One Bowl Chocolate Fudge Cake – Moist, Easy & Fudgy Recipe

Jump to Recipe Print Recipe

If you’re looking for the kind of chocolate cake that makes people close their eyes with the first bite — this is it. This One Bowl Chocolate Fudge Cake is ridiculously rich, deeply chocolatey, and has that soft, melt-in-your-mouth texture that stays moist for days. And don’t even get me started on that fluffy cocoa fudge frosting — it’s creamy, dreamy, and sweet in all the right ways. 💯

Already tried my Super Moist Chocolate Cake? Think of this one as the easy, no-mixer version. It’s got all the chocolatey goodness, but with fewer steps and way less cleanup. You only need one bowl, a whisk, and a handful of pantry staples. I’ve made this cake more times than I can count, and it always delivers whether it’s for a last-minute dessert, a weekday craving, or a casual “just because” chocolate moment.

A fudgy squareslice of chocolate cake topped with fluffy old-fashioned chocolate frosting and sprinkled chocolate shreds

Why This One Bowl Chocolate Fudge Cake Recipe Works

One bowl, no stress – No need to haul out the stand mixer. This batter comes together in one bowl with a whisk (or even a spoon if you’re feeling rustic). Less mess, more cake.

Super moist and fudgy – Thanks to sour cream, oil, and hot coffee, this cake bakes up ultra-moist and stays soft for days. No dry crumbs here — just rich, tender chocolate goodness in every bite.
Fluffy fudge frosting – This isn’t ganache. It’s that old-school chocolate fudge frosting made with cocoa powder, butter, and powdered sugar. Silky, sweet, and totally nostalgic — like the stuff on bakery birthday cakes (but better).
Small batch, big flavor – Baked in one 8-inch pan, it’s the perfect size for casual chocolate cravings or small gatherings. You’ll get 9 to 12 generous slices or fewer if you’re slicing with your heart instead of your eyes. 😉

Expert Baking Tips for the BEST Chocolate Fudge Cake

Don’t over-mix the batter – This cake is super moist thanks to the oil and sour cream, but over-mixing can still make it dense. Once everything looks smooth and combined, stop stirring and let the oven do the rest.
Bloom that cocoa – Mixing the cocoa powder with hot coffee (or water) helps unlock its full flavor. It deepens the chocolate taste in a way cold liquid just can’t.
Use room temp ingredients – Cold eggs and sour cream can cause the batter to seize or bake unevenly. Let everything sit out for about 20 minutes before you start mixing.
Don’t skimp on sugar – Sugar doesn’t just sweeten — it helps keep moisture locked in and balances out the bitterness of the cocoa. Cutting it too much can leave your cake dry and dull.
Know when it’s done – The top should spring back when gently pressed, and a toothpick inserted in the center should come out with just a few moist crumbs (not wet batter).
Frosting too thick? – Add a tablespoon of cream or milk to loosen it up. Too soft? Pop it in the fridge for 5–10 minutes before spreading.

Want to make it layered? – Double the recipe and bake it in two 8-inch round pans. You’ll have a beautiful celebration cake that still feels homemade.

fudgy chocolate cake slice with frosting

Ingredients for One Bowl Chocolate Fudge Cake

All-purpose flour – I use unbleached all-purpose flour for structure without making the cake dense. No need for cake flour here, we’ve got enough moisture to keep it soft and tender.
Dutch-process cocoa powder – This gives the cake its bold, bakery-style chocolate flavor. You can use natural cocoa, but Dutch makes it smoother and more intense.

Light brown sugar – Adds moisture and a subtle molasses flavor that makes the cake extra fudgy. I like using light brown sugar, but dark will work if that’s what you have.
Granulated sugar – Sweetens the cake and helps create a fine, soft crumb. Paired with brown sugar, it keeps things balanced sweet but not too sweet.
Eggs – Two large eggs hold everything together and give the cake structure without making it feel dry or overly firm.

Vegetable oil – Oil is the secret to long-lasting moisture. Since it stays liquid at room temperature, your cake stays soft even a couple of days after baking. Use canola, sunflower, or any neutral oil.
Full-fat sour cream – This adds richness, creaminess, and that signature soft crumb. You can sub in full-fat Greek yogurt if needed, but sour cream gives the best texture.
Hot water + instant coffee – Coffee boosts the flavor of the cocoa without adding a coffee taste. You can use hot water if you prefer, but coffee gives it that deep, intense chocolate vibe.

Vanilla extract – Even with all the chocolate, vanilla rounds everything out and adds warmth. Don’t skip it!
Chocolate chips (optional but so worth it) – Fold in a handful of semi-sweet chocolate chips if you want little melty chocolate pockets throughout the cake. Totally optional, but I say go for it. 😍
Chocolate shreds for topping – I like to finish the cake with a light sprinkle of chocolate shreds once it’s frosted. It adds a bit of texture and gives that bakery-style look. Totally optional — but highly recommended if you’re serving it for guests

Ingredients for the Fluffy Fudge Frosting

Unsalted butter – Adds body and richness, and whips into something ultra creamy and smooth once blended with cocoa and sugar. Make sure it’s softened (not melted!) for best texture.
Cocoa powder – I use the same Dutch-process cocoa as in the cake for that bold chocolate flavor. Sift it first to avoid any clumps in the frosting.
Powdered sugar – This is what makes the frosting light, fluffy, and spreadable. Always sift, it makes a big difference in how silky your final frosting turns out.

Heavy cream – Gives the frosting richness and a soft, whipped consistency. You can use whole milk if needed, but cream makes it feel like classic bakery frosting.
Vanilla extract – Brings in warmth and rounds out the chocolate flavor. Just a splash adds a cozy homemade touch.
Pinch of salt – A little salt cuts through the sweetness and sharpens the cocoa flavor. Don’t skip it! It really brings everything together.

How to Make One-Bowl Chocolate Fudge Cake (Step-By-Step Instructions)

This one-bowl recipe is super easy — no mixer needed (unless you’re whipping up the frosting!). The result? A rich, moist chocolate fudge cake topped with fluffy, old-school cocoa frosting that tastes just like childhood birthdays.

STEP 1). Prep your pan. Preheat your oven to 350°F (175°C). Lightly grease and line an 8-inch square or round cake pan with parchment paper for easy removal after baking.
STEP 2). Combine the dry ingredients. In a large mixing bowl, whisk together the flour, cocoa powder, baking powder, baking soda, salt, brown sugar, and granulated sugar until well blended and lump-free.

STEP 3). Add the wet ingredients. Crack in the eggs, then add the oil, sour cream, and vanilla extract. Whisk everything together until the batter is smooth and thick — it might look dense at first, but trust the process.
STEP 4). Mix in the hot coffee. Dissolve the instant coffee (if using) in the hot water. Slowly pour the mixture into the batter in two additions while whisking gently. The batter will thin out and become glossy — that’s exactly what you want.
STEP 5). Optional chocolate chips.
Fold in chocolate chips if you’re using them. They melt into the cake and give you little pools of fudgy goodness in every bite.

STEP 6). Bake. Pour the batter into your prepared pan and smooth out the top. Bake for 28–32 minutes, or until the top springs back lightly and a toothpick comes out with a few moist crumbs. Let the cake cool in the pan for 15 minutes, then transfer it to a rack to cool completely.
STEP 7). Make the frosting. In a small saucepan, melt the butter over low heat. Stir in the cocoa powder until smooth and glossy. Transfer the mixture to a mixing bowl. Add half of the powdered sugar and half of the cream and beat to combine. Add the rest of the powdered sugar, cream, vanilla, and salt. Beat until fluffy and smooth. Adjust the consistency with more cream if needed.
STEP 8). Frost and slice. Once your cake is completely cool, generously slather on that fluffy fudge frosting, sprinkle over some chocolate shreds, then slice and serve — no one’s stopping at just one piece.

Moist chocolate fusge cake cut into squares

Fluffy Chocolate Fudge Frosting (Just Like Birthday Cakes!)

This frosting is giving full-on birthday cake vibes — rich, creamy, and unapologetically chocolatey. It’s not ganache, it’s that fluffy cocoa fudge frosting you used to lick off cupcakes at every school party. 🥹 It’s made with real butter, cocoa powder, powdered sugar, and cream — no fuss, just that classic flavor you crave. If you’ve already tried my Whipped Ganache Frosting, you’ll want to keep this one in your frosting lineup too. It spreads like a dream and tastes amazing on everything.

Recipe FAQ

Can I make this frosting ahead of time?

Yes! You can make it up to 3 days in advance. Store it in an airtight container in the fridge. When you’re ready to use it, let it come to room temperature and re-whip it until smooth and fluffy again.

Do I have to use heavy cream?

Heavy cream gives the frosting that rich, bakery-style texture, but you can use whole milk in a pinch. Just start with less and add more as needed — it won’t be as fluffy, but it’ll still taste amazing.

Can I make this one bowl chocolate cake ahead of time?

Yes! The cake stays moist for days. Bake it, let it cool completely, then wrap it tightly in plastic wrap and keep it at room temp for up to 2 days or refrigerate for up to 5 days.

Do I have to use coffee in the batter?

Nope — hot water works too. The coffee just deepens the chocolate flavor without making it taste like coffee. If you’re sensitive to it or don’t have any, skip it and use plain hot water instead.

What kind of cocoa powder should I use?

I recommend Dutch-process cocoa powder for the best deep chocolate flavor. It’s smoother and less acidic than natural cocoa, which gives the frosting a more classic fudge taste.

What’s the best oil to use?

Any neutral oil works — like canola, vegetable, sunflower, or light olive oil. I wouldn’t recommend coconut oil unless it’s refined and flavorless.

My frosting is too thick — what do I do?

Add a little more cream, one teaspoon at a time, and keep mixing until it loosens up. If it’s been sitting for a while, a quick re-whip usually helps too.

Can I freeze this frosting?

It sure is! It holds its shape beautifully for piping swirls, borders, or even cupcakes — just make sure it’s not too warm or too soft before you start.

chocolate fudge cake with thick cocoa frosting

Craving More Chocolate? Here Are More Favorites to Try:

Super Moist Chocolate Cake – The one I baked in the bakery for years. Rich, soft, and layered with chocolate buttercream.
Best Bakery-Style Chocolate Buttercream Frosting – Sweet, fluffy, and pipeable. Perfect for layer cakes and cupcakes.
Whipped Dark Chocolate Ganache Frosting – Ultra light and glossy with bold cocoa flavor. It spreads like a dream.

Double Chocolate Chip Muffins – Bakery-style muffins packed with chocolate chips in every bite.
Dark Chocolate Peanut Butter Cups – A no-bake favorite with rich dark chocolate and creamy peanut butter centers.