Easy Microwave Chocolate Mug Cake Recipe

This easy microwave chocolate mug cake is a rich, single-serving dessert made with simple pantry ingredients. Stir the batter right in the mug, microwave it for about one minute, and let it rest briefly for a soft, cake-like texture. Add chocolate chips for pockets of melted chocolate in every bite.

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When I want chocolate cake but do not need an entire cake sitting on the counter, this is the recipe I make. It takes only a few minutes, uses ingredients I usually have, and leaves me with one mug and one fork to wash.

No mixer, no cake pan. No turning the oven on.

The most important thing to know about microwave mug cakes is that they cook quickly. Start with 50 seconds, check the center, and add more time in 10-second bursts only when needed. That little bit of patience is what keeps the cake soft instead of dry and rubbery.

I love this cake because it’s the perfect portion for one. You get your chocolate fix without a whole cake sitting around tempting you to cut another slice.

For another small dessert when you do not need a whole pan, try my Single-Serve Apple Crumble.

Recipe Highlights

Ingredients Worth Knowing

• Butter: Melted butter adds flavor and moisture. Melt it directly in the mug before adding the other ingredients.
• All-purpose flour: Flour gives the cake its structure. Spoon the flour into the measuring spoon and level it off rather than packing it down. Too much flour can make a mug cake heavy or dry.
• Granulated sugar: Sugar sweetens the cake and helps keep the texture soft.
• Unsweetened cocoa powder: Use unsweetened cocoa powder, not hot cocoa mix. Cocoa powder gives the cake its deep chocolate flavor without adding extra sugar.
• Dark chocolate chips: Dark or semisweet chocolate chips melt into the batter as the cake cooks. They are optional, but they make the cake more chocolatey and help the center stay soft. (I always use the good stuff like Guittard or Ghirardelli!)
• Baking powder: Baking powder helps the cake rise in the microwave. Measure it carefully because too much can leave an unpleasant aftertaste.
• Egg yolk: Use the yolk from one large egg. The yolk adds richness and helps hold the cake together without making a single-serving cake taste too eggy.
• Water: Adds moisture to the batter. You can swap in milk to make the cake even richer.
• Vanilla extract: Vanilla smooths out the cocoa flavor and makes the chocolate taste fuller. You can use store-bought vanilla or my [Homemade Vanilla Extract].

Choosing a Mug

• Use a microwave-safe mug that holds at least 12 ounces. A larger mug gives the batter enough room to rise without spilling over the top.
• A wide mug generally cooks more evenly than a tall, narrow mug. Avoid mugs with metallic trim or decoration because they are not safe to use in a microwave.
• The mug will become hot while the cake cooks, so use a potholder when removing it.

How to Make a Chocolate Mug Cake in the Microwave

Get ready, because this is going to be fast!

Step 1: Melt the butter
Place the butter in a microwave-safe mug. Microwave it for 20 to 35 seconds, or just until melted.

Microwaves vary, so keep an eye on it. The butter does not need to bubble.

Tip: I melt the butter first while I grab the other ingredients.

Step 2: Make the batter
Add the flour, sugar, cocoa powder, chocolate chips, baking powder, egg yolk, water, and vanilla to the melted butter.

Stir well with a fork, reaching all the way into the bottom edges of the mug. Continue mixing until no dry flour or cocoa remains, and the egg yolk is fully blended into the batter.

The batter will be fairly thick, but it should be evenly mixed.

Step 3: Microwave the cake
Place the mug in the center of the microwave and cook on high for 50 seconds.

Check the cake. The top should look mostly set, and the center should no longer look like wet batter. It may still appear slightly soft.

When the center is shiny or clearly wet, microwave it for another 10 seconds. Continue in 10-second bursts only until the top is set.

Do not wait for the cake to look completely dry. It will continue cooking as it rests.

Step 4: Let it rest
Let the mug cake stand for 2 minutes before eating. This gives the center time to finish setting and allows the cake to cool enough to eat safely.

Add whipped cream, ice cream, caramel sauce, or powdered sugar, then grab a spoon.

And just like that, you have a warm chocolate dessert all to yourself.

How Long Does a Microwave Mug Cake Take?

Most mug cakes take between 50 and 80 seconds in the microwave, but the exact time depends on your microwave’s wattage and the size and shape of the mug.

Start with 50 seconds, then add more time in 10-second bursts as needed. It is easy to cook the cake a little longer, but an overcooked mug cake can quickly become dry or rubbery.

The cake is ready when the top looks set, the center no longer looks like raw batter, and the edges have started to pull slightly away from the mug. The center should still look soft rather than dry.

Recipe

Tried it? Rate ⭐⭐⭐⭐⭐ & comment below—your feedback keeps the oven mitts flying here at One Hot Oven.

First published: August 29, 2025. Last updated: July 31, 2026, with clearer microwave timing and helpful mug cake tips.

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