Easy One-Bowl Chocolate Cake With Chocolate Frosting

Name: Easy One-Bowl Chocolate Cake With Chocolate Frosting
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 12
Cuisine: American
Ingredients: 2 cups all-purpose flour; 2 cups granulated sugar; 3/4 cup unsweetened cocoa powder; 2 teaspoons baking soda; 1 teaspoon baking powder; 1 teaspoon salt; 1 cup buttermilk; 1/2 cup vegetable oil; 2 large eggs; 1 teaspoon vanilla extract; 1 cup hot coffee

I’ll never forget the first time I tried to make this cake. It was for my dad’s birthday, and I was so proud of myself for not buying a store-bought one. I was rushing, of course, and I accidentally used salt instead of sugar. I kid you not. We took one bite and just looked at each other. It was the most disgusting, yet hilarious, chocolate cake we’d ever tasted. That disaster is exactly why I love this Easy One-Bowl Chocolate Cake With Chocolate Frosting recipe now. I’ve made every mistake so you don’t have to, and when you get it right, it’s pure, simple comfort food.

Recipe Card

Recipe Title	Easy One-Bowl Chocolate Cake With Chocolate Frosting
Servings	12
Prep Time	15 minutes
Cooking Time	35 minutes
Calories	Approx. 420

Ingredients

2 cups all-purpose flour
2 cups granulated sugar
3/4 cup unsweetened cocoa powder
2 teaspoons baking soda
1 teaspoon baking powder
1 teaspoon salt
1 cup buttermilk
1/2 cup vegetable oil
2 large eggs
1 teaspoon vanilla extract
1 cup hot coffee

That hot coffee is the secret weapon, trust me. The first time I saw it in a recipe I thought it was a typo. I made it without once and the cake was just… fine. A little dense. The coffee doesn’t make it taste like coffee, it just makes the chocolate flavor explode. It’s the difference between a good cake and a “wow” cake. And for the love of all that is holy, double-check you’re using sugar, not salt. I still keep my sugar in a giant, clearly labeled jar because of my infamous first attempt.

Directions

Preheat your oven to 350°F (175°C). Grease and flour a 9×13 inch baking pan.
In a large bowl, whisk together the flour, sugar, cocoa, baking soda, baking powder, and salt.
Add the buttermilk, oil, eggs, and vanilla to the dry ingredients.
Beat with an electric mixer on medium speed for about 2 minutes until it’s all combined.
Carefully stir in the hot coffee with a spatula. The batter will be very thin, that’s normal!
Pour the batter into your prepared pan and smooth the top.
Bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
Let the cake cool completely in the pan on a wire rack before frosting.

The thin batter always freaks me out. The first time I saw it, I was convinced I’d forgotten an entire cup of flour. I almost dumped more in, but I’m so glad I didn’t. That liquidy batter is what makes the cake so incredibly moist. Just trust the process and pour it in. Also, do not, I repeat, do NOT try to frost this cake while it’s even slightly warm. I was impatient once and the frosting just melted into a sad, greasy puddle on top. It tasted okay, but it looked like a swamp.

This cake has saved my butt more times than I can count. I’ve brought it to potlucks where people literally asked for the bakery name. It’s my go-to for when I need a family favorite that feels fancy but is secretly so easy. The leftovers (if you have any) are almost better the next day, just cover it with plastic wrap. I love that it’s a one-pot wonder, meaning less cleanup and more time to actually enjoy the evening.

I’ve tried making a “healthier” swap version using applesauce instead of oil. It was… edible. But it was also gummy and sad. Some things are just meant to be indulgent, you know? This is that thing. It’s a celebration cake, a bad-day cake, a just-because cake. It’s the definition of comfort food for my family, and I wouldn’t change a thing about it, except maybe to always make two so we have one for later.

Nutrition Info (per serving)

Calories	Carbs	Fat	Protein
420	68g	17g	5g

Okay, let’s be real, this is a dessert cake. It’s not a health food. I don’t even try to pretend it is. But you know what? A little slice of pure, happy indulgence is good for the soul. I have made it with gluten-free flour blend for a friend and it worked surprisingly well, just make sure your blend has xanthan gum in it. For dairy-free, I’ve used almond milk with a tablespoon of vinegar instead of buttermilk and it turned out great.

Ingredient Swaps

Ingredient	Substitution
Buttermilk	1 cup milk + 1 tbsp vinegar or lemon juice, let sit 5 min
Hot Coffee	Hot water
Vegetable Oil	Melted coconut oil

The milk and vinegar swap is my go-to when I realize I have no buttermilk. It works perfectly every time. The hot water instead of coffee is fine, the cake will still be good, but it just won’t have that deep, rich chocolate kick. As for coconut oil, it works but it gives a very, very slight coconut flavor. I did it once for a piña colada themed party and it was a hit, but for a pure chocolate hit, stick with a neutral oil.

Tips

Use a kitchen scale to measure your flour if you can. Just scooping with a cup can pack in too much and make the cake dry.
Don’t overmix after adding the coffee! Just stir until it’s combined. Overmixing can make the cake tough.
Let the cake cool for a solid hour before you even think about frosting it. Patience is a virtue I often lack, but it’s crucial here.

I learned the flour lesson the hard way. I used to just dunk my measuring cup into the bag and pack it in. My cakes were always a little dense and dry. Once I started gently spooning the flour into the cup and leveling it off, or better yet, using a scale, it was a total game-changer. The texture went from “okay” to “incredibly soft and tender.” It’s a small step that makes a huge difference.

FAQ

Can I make this into cupcakes?
Absolutely! This recipe makes about 24 cupcakes. Just line your muffin tins and fill them about 2/3 full. They’ll bake faster, so start checking them at around 18-20 minutes. I did this for my kid’s class party and they were gone in minutes.

My cake sunk in the middle, what did I do?
Oh, I’ve been there. It usually means it was underbaked, or you opened the oven door too early and too often. The rush of cold air makes it collapse. Try to resist peeking until at least the 25-minute mark. If it’s a little sunken, just pile on extra frosting. No one will ever know.

Can I frost this with something else?
Of course! A cream cheese frosting is amazing with this. Or a simple vanilla buttercream. But for me, the classic chocolate frosting is the one. It’s like they were made for each other. I once tried a peanut butter frosting and it was fantastic, but it’s a richer, heavier combo.

That’s everything I know about making Easy One-Bowl Chocolate Cake With Chocolate Frosting! Hope you give it a try. And if you mess it up, you’re in good company—I still do it sometimes. Just call it a “rustic” cake and eat it with a fork straight from the pan. No judgment here.