Simple Table Recipes
Desserts

Chocolate Mug Cake

A single-serving chocolate cake mixed and cooked in the mug, ready in under ten minutes with pantry ingredients.

A chocolate mug cake risen above the rim of a speckled cream mug, topped with melted chocolate chips
Prep
5 min
Cook
2 min
Total
7 min
Makes
1 serving
Difficulty
Easy
  • Measurements grams + cups
  • Cuisine American
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Why You'll Like This Recipe

  • Mixed in the mug, so there is one thing to wash.
  • Scaled for one person, which means no leftover cake sitting on the counter.
  • Start to finish in under ten minutes, most of which is the standing time at the end.

Ingredient Notes

Cocoa powder
The entire chocolate flavour comes from here, so use one you like. Natural and Dutch-process both work — Dutch-process is darker and milder, natural is sharper and fruitier.
Neutral oil
Oil rather than butter, and not only for convenience. Oil stays liquid at every temperature, which keeps the crumb moist in a cake that goes from raw to done in ninety seconds.
Baking powder
A quarter teaspoon is enough. More does not make a lighter cake — it makes one that climbs out of the mug and then collapses.

Equipment

  • Microwave-safe mug holding at least 350 mL / 12 oz
  • Fork or small whisk
  • Measuring spoons

Substitutions

Milk
Any dairy or plant milk works. Oat and soy behave closest to dairy; water alone works but gives a plainer, drier crumb.
All-purpose flour
A cup-for-cup gluten-free blend works. Let the mixed batter sit for 2 minutes before microwaving so the flour hydrates.
Chocolate chips
A spoonful of peanut butter or hazelnut spread dropped into the centre of the batter before cooking gives a molten middle instead.

Storage

Storing: Best eaten immediately. A mug cake left to sit firms considerably as it cools and does not reheat well.

Frequently Asked Questions

Why is my mug cake rubbery?

It cooked too long. Microwaves heat the whole batter at once rather than from the outside in, so the window between set and overdone is only a few seconds. Stop as soon as the top loses its wet shine.

Why did my mug cake overflow?

The mug was too small. The batter roughly doubles in the first thirty seconds. Use one that holds at least 350 mL / 12 oz and fill it no more than halfway.

Can I make a mug cake without eggs?

This recipe has none. At single-serving scale an egg is too much structure for the quantity of flour, and it is what makes many mug cakes turn out dense and omelette-like.

Can I bake this in the oven instead?

Yes. Pour into a small oven-safe ramekin and bake at 180 C / 350 F for 12 to 15 minutes, until a skewer comes out with a few moist crumbs.

Why is my mug cake dry?

Overcooking, or too much flour. Spoon the flour into the measure rather than scooping with it, which compacts it and can add a third more than intended.

Can I double it in one mug?

Better not. Doubled batter in one mug cooks unevenly, leaving a wet middle and rubbery edges. Make two mugs and cook them one at a time.

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