Weeknight

Chocolate Mug Cake for Two
with Melty Chocolate Chips

Name: Chocolate Mug Cake for Two with Melty Chocolate Chips
Prep time: 3 min
Cook time: 4 min
Total time: 7 min
Yield: 2 mug cakes
Cuisine: American
Ingredients: 8 tablespoons all-purpose flour (60 g); 4 tablespoons sugar (50 g); 3 tablespoons cocoa powder (16 g); 1/4 teaspoon baking powder; 1 pinch fine salt; 6 tablespoons milk (90 ml); 3 tablespoons vegetable oil (45 ml); 1/2 teaspoon vanilla extract; 2 tablespoons chocolate chips (22 g) — for the molten center; Powdered sugar or a small scoop of ice cream, for the top

Ingredients Cooking steps

Prep 3 minCook 4 minTotal 7 minEasyServes 2

“Two mugs, one fork each, molten middle.”

By Sok Heng Oeun, Founder and Reviewer · Published July 19, 2026 · Updated September 22, 2026

This is the late-evening chocolate cake: enough for two people, made from flour, sugar, cocoa, milk and oil that are already in the cupboard, mixed with a fork directly in the mugs and cooked one mug at a time in the microwave. There is no pan to wash and no leftover cake.

It has no egg on purpose. In a cake this small, one egg is far too much protein, and microwaved egg is what makes most mug cakes rubbery; oil and milk keep this crumb soft. A spoonful of chocolate chips pushed under the surface melts into a molten centre while the cake around it sets.

The promise: about seven minutes, two mugs, one fork each, and a soft chocolate cake with a molten middle.

← Back to recipes

How to make it

View ingredient overview

All ingredients for Chocolate Mug Cake for Two, labeled — 🧺 Everything you need, all in one look

🧂 Ingredient notes & easy swaps

No egg, on purpose. One egg is too much for two small cakes, and microwaved egg protein is what turns mug cakes rubbery. Oil plus milk keeps the crumb tender at microwave speed. Any unsweetened cocoa works; Dutch-process gives the darkest colour and flavor, natural cocoa is a little sharper. Use big mugs, at least 12 ounces, because the batter climbs to nearly double its height while cooking before settling back. Microwaves vary: the timing assumes about 1000 watts; a 700-watt machine needs 15–20 extra seconds. The "Cook 4 min" above covers both mugs cooked one after the other plus the one-minute rest.

🍳 What you actually need (equipment)

Two large microwave-safe mugs (12 oz or bigger, straight-sided if you have them, so the cake cooks evenly), a fork, and measuring spoons.

Whisk the dry, right in the mugs. Into each mug: 4 tablespoons flour, 2 tablespoons sugar, 1 1/2 tablespoons cocoa, 1/8 teaspoon baking powder (half the total), and a small pinch of salt. Stir with a fork until no pockets of cocoa or flour hide at the bottom.
Add the wet. Into each mug: 3 tablespoons milk, 1 1/2 tablespoons oil, and 1/4 teaspoon vanilla. Stir until just smooth, scraping the fork around the bottom edge where dry flour collects.
Bury the chocolate chips. Drop a tablespoon of chocolate chips into the center of each mug and push them just under the surface. Do not stir them in; they need to stay clustered to become the molten middle.
Microwave ONE mug at a time, 60 to 75 seconds on full power. The cake will rise well above the batter line, then settle. It is done when the top looks set but still glossy at the very center. Cook the second mug the same way.
Resist the extra seconds. A slightly shiny centre spot is the goal; that is the melted chip cluster. The cake keeps cooking from its own heat after the microwave stops, so an extra 30 seconds to be safe is the most common reason a mug cake comes out dry and rubbery.
Rest one minute, then top and serve. Dust with powdered sugar, or drop a small scoop of vanilla ice cream into the dip in the middle. Eat warm from the mug with a spoon; the cake turns dense once it cools.

✅ How to know the mug cake is done

The top should be set and springy at the edges with a small glossy spot in the middle; that spot is the melted chip cluster, not raw batter. If the whole top is wet, give it 10 more seconds and check again. If it looks dry and cracked across the top, it is overcooked; the crumb will be firm, and a scoop of ice cream helps.

💡 Practical tips (and what not to do)

One mug at a time in the microwave. Two mugs share the microwave's power and both cook unevenly, with one raw side each; 70 seconds apiece is still quick.
Check at 60 seconds, then add 10 at a time. Microwave wattage and mug shape both change the timing. Once you know your machine's number, it is the same every time.
Do not stir in the chips. Clustered chips melt into a molten centre; stirred chips disappear into the crumb.
Level the cocoa and flour. A heaped spoon of cocoa in a cake this small makes it dry and bitter; a heaped spoon of flour makes it tough. Level the spoons with a knife.
Other fillings work the same way: a teaspoon of peanut butter dropped in with the chips, a soft caramel, or three mini marshmallows, all pushed just under the surface.

💛✨ Flavor boost

Add a small pinch of instant espresso powder or an extra pinch of salt to the dry ingredients in each mug. Neither makes the cake taste of coffee or salt at this amount; both make the cocoa taste more like chocolate, which matters in a cake with only 1½ tablespoons of cocoa per mug and no butter to carry the flavor.

🍨 What Goes Well With It

A small scoop of vanilla ice cream melting into the warm middle.
Cold milk.
A few raspberries or sliced strawberries on top, for something sharp against the chocolate.
A spoonful of whipped cream and a little extra cocoa dusted over.

📦 Storage & Freezer Notes

It does not keep. A mug cake is tender for about 20 minutes and turns dense and dry as it cools; reheating does not bring it back. Make it when you will eat it.
Prep ahead: measure the dry ingredients into two mugs or small jars in advance. Add the milk, oil and vanilla, stir, and microwave when wanted.
Doubling: do not double within one mug; the batter rises to nearly twice its height and will overflow. More people means more mugs, cooked one after another.

🧒 Serving Ideas for Kids

Children can measure and fork-whisk their own mug; an adult handles the microwave and the hot mug.
Dry-mix "cake kits" in small jars work well for sleepovers: each child adds milk, oil and vanilla to their own jar's contents in a mug.
Do not skip the one-minute rest for children: the chocolate centre is much hotter than the cake around it straight out of the microwave.

❓ Quick answers

Why did my mug cake come out rubbery?

Almost always overcooking: the cake keeps cooking from its own heat after the microwave stops, so a cake that looked barely done at the beep is overdone a minute later. Pull it while the middle still glistens. If you added an egg to this recipe, that is the other cause; the egg is left out on purpose.

Can I make it in the oven instead?

Yes: divide the batter between two 6-oz ramekins and bake at 350°F (175°C) for 12–14 minutes, until the edges are set and the middle still looks soft. The molten centre works the same way. That takes about 20 minutes with the oven preheat; for a bigger crowd our One-Bowl Chocolate Fudge Cake with a Moist Cocoa Crumb is less work per serving.

Can I make it dairy-free or gluten-free?

Both. Any plant milk works one-for-one (oat gives the softest crumb), and a 1-to-1 gluten-free flour blend behaves fine at this scale because the cake sets in the microwave before the batter can turn gummy. Check that the chocolate chips are dairy-free if that matters.

Is the raw batter safe to taste without eggs?

Leaving out the egg removes one risk, but raw flour can carry bacteria and is not considered safe to eat uncooked. If you want to taste the batter, heat the flour first: spread it on a plate and microwave it in 30-second bursts, stirring, until it reaches 165°F (74°C), then let it cool before measuring.

🥗 Nutrition, roughly: about 350 calories per mug with 5g protein, 46g carbs, and 17g fat, without the ice cream. Estimates only; brands, cuts and portion sizes change the numbers.

Published by MommyCooking.org. AI assists with web copy; food images are generated illustrations. The publisher confirms the recipes were tested before publication. Nutrition is estimated. Editorial policy · Report a correction.

More recipes for your table

← Every recipe