Easy 5-Minute Chocolate Mug Cake

When a serious chocolate craving hits and only a warm, fudgy cake will fix it, this mug cake delivers in five minutes flat. Everything mixes right in the mug, no bowl or mixer needed, and the microwave does the rest.

It’s rich, deeply chocolatey, and exactly the right size for one person. The top sets with a slight crust while the center stays dense and almost molten, especially if you pile on a few extra chocolate chips before cooking.

What Makes This Mug Cake So Good

I keep coming back to this one because it tastes like real cake from an oven. The cocoa gives it a dark, earthy chocolate flavor that’s not too sweet, and the oil keeps it tender from the first bite to the last.

Texture-wise, it walks that line between a steamed pudding and a brownie. Eat it straight from the mug with a spoon, and if you have a scoop of vanilla ice cream melting into the warm cake, it’s even better.

Ingredients

• 3 tbsp all-purpose flour: spooned and leveled so the cake doesn’t turn out dense.
• 2 tbsp granulated sugar: sweetens without overpowering the chocolate.
• 2 tbsp unsweetened cocoa powder: natural or Dutch-processed both work.
• 1/8 tsp baking powder: just enough lift for a tender crumb.
• Pinch of salt: makes the chocolate pop.
• 3 tbsp whole milk: cold from the fridge is fine; adds richness.
• 2 tbsp neutral vegetable oil: canola or sunflower oil keep the cake soft.
• 1/4 tsp vanilla extract: rounds out the flavor.
• 2 tbsp semisweet chocolate chips: will melt into little pockets of gooeyness.

Variations / Substitutions

• Swap oil for melted butter: gives a richer, slightly denser crumb and a butterier finish.
• Use brown sugar instead of white sugar: adds a hint of molasses and a softer center.
• Add 1/2 tsp instant espresso powder: intensifies the chocolate flavor without making it taste like coffee.
• For dairy-free: use almond or oat milk and dairy-free chocolate chips; the oil is already plant-based.
• Toss in a few chopped nuts or a pinch of cinnamon: for crunch or warmth.

If you want a baked chocolate dessert with a gooey center, try my Classic Chocolate Lava Cake.

How to Make Chocolate Mug Cake

Step 1: Mix the Dry Ingredients

In a microwave-safe mug that holds at least 12 oz, whisk together the 3 tablespoons flour, 2 tablespoons sugar, 2 tablespoons cocoa powder, 1/8 teaspoon baking powder, and a pinch of salt with a small fork or mini whisk. Make sure there are no lumps of cocoa hiding in the bottom.

Step 2: Add the Wet Ingredients

Pour in the 3 tablespoons milk, 2 tablespoons oil, and 1/4 teaspoon vanilla extract. Stir everything together until you have a smooth, glossy batter with no dry streaks. Fold in the 2 tablespoons chocolate chips, saving a few to scatter on top right before you microwave.

Step 3: Microwave and Top

Place the mug in the microwave and cook on high for 60 to 75 seconds, depending on your microwave’s power. The cake will puff up and the top will look just set and slightly glossy in the center. Let it stand for 1 minute to finish cooking from residual heat, then add a scoop of ice cream right on top and dig in.

A Few Notes Before You Start

• Use a 12-ounce or larger mug to prevent batter from spilling over the top.
• Spoon the flour into your tablespoon measure and level it with the back of a knife; packing the flour makes the cake dry and heavy.
• For the fudgiest center, press 4 or 5 extra chocolate chips into the surface of the batter right before microwaving.
• Stop the microwave as soon as the edges are firm and the center looks just barely wet; the cake keeps cooking as it sits.

Microwave cook times by wattage:

Frequently Asked Questions

Can I make this mug cake without oil?

Yes, you can replace the oil with 2 tablespoons of unsweetened applesauce. The cake will be a bit denser and slightly less rich, but still moist and chocolatey.

Can I use hot chocolate mix instead of cocoa powder?

No, hot chocolate mix has sugar and powdered milk built in, so it won’t give you the same deep chocolate flavor. Stick with unsweetened cocoa powder for the best result.

Can I double the recipe and use a bigger mug?

You can double the ingredients in a 20-ounce mug or a small microwave-safe bowl, but you’ll need to increase the cook time to about 90 to 105 seconds. Check the center and add 10-second bursts until it looks just set.

Can I bake this in a regular oven instead of using the microwave?

Yes, but the speed changes completely. Pour the batter into a small greased ramekin and bake at 350°F (175°C) for 12 to 14 minutes, until the top springs back when touched lightly.

Chocolate Mug Cake Recipe

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Prep Time 4 minutes mins

Cook Time 1 minute min

Total Time 5 minutes mins

Servings: 1 servings

Calories: 550

Ingredients Method Notes

Ingredients

  

• 3 tbsp all-purpose flour
• 2 tbsp granulated sugar
• 2 tbsp unsweetened cocoa powder
• 1/8 tsp baking powder
• Pinch of salt
• 3 tbsp whole milk
• 2 tbsp neutral vegetable oil
• 1/4 tsp vanilla extract
• 2 tbsp semisweet chocolate chips

Method

 

1. In a 12-oz microwave-safe mug, whisk together the flour, sugar, cocoa powder, baking powder, and salt until lump-free.
2. Add the milk, oil, and vanilla. Stir until smooth, then fold in the chocolate chips, keeping a few to place on top.
3. Microwave on high for 60 to 75 seconds until the top looks set but still slightly glossy in the center. Let the cake rest for 1 minute, then serve warm straight from the mug.

Notes

Best eaten right after it cools for a minute so the center doesn’t cook too far. If you swap in gluten-free flour, use a blend designed for cup-for-cup baking; the texture may be a little grainier but still works.