Easy Desserts
This easy brownie mug cake is fudgy, chocolatey, and ready in about one minute in the microwave. One mug, a few pantry staples, no oven needed.
A brownie mug cake is one serving of fudgy chocolate cake cooked in a mug in the microwave. Mine takes about one minute on high, and you mix it in the same mug you cook it in. No oven, no pan, no waiting for anything to cool.
I make mine at 8pm when the brownie craving shows up and the kitchen is already clean. You need six things you probably have: butter, sugar, cocoa, an egg, flour, and a pinch of salt. That is it.
The trick is knowing when to stop the microwave. Ten extra seconds turns fudgy into rubbery, and I will show you exactly what to look for.
About the Ingredients
2 tablespoons (28g) unsalted butter
Melt it right in the mug first so you do not dirty a bowl. Salted butter works too, just skip the pinch of salt later.
2 tablespoons (25g) granulated sugar
White sugar keeps the crumb soft. Brown sugar gives a deeper, almost caramel taste but makes the top wetter.
1 tablespoon (6g) unsweetened cocoa powder
Use natural cocoa, not Dutch process, if you can. Dutch process tastes milder and the cake rises a little less.
1 large egg
One egg is the whole batter base here. If you only have medium eggs, add a teaspoon of milk so it does not dry out.
3 tablespoons (24g) all-purpose flour
Do not pack the spoon. Scoop it loose and level it off, or the cake turns dense and bouncy.
1/8 teaspoon salt
A small pinch. It makes the chocolate taste more like chocolate and less flat.
1 tablespoon (15g) chocolate chips
Optional but worth it. They sink and melt into a soft pocket in the middle. Dark, milk, or a chopped square of chocolate all work.
Step-by-Step Instructions
1. Melt the butter
Put the butter in a 12-ounce mug and microwave on high for 20 to 30 seconds, until it is fully melted. Swirl it up the sides to grease the mug.
2. Stir in sugar and cocoa
Add the sugar, cocoa, and salt. Stir with a fork until it looks like thick, glossy mud with no dry cocoa left.
3. Beat in the egg
Crack in the egg and beat hard for about 20 seconds. The mixture should turn smooth and a shade lighter.
4. Fold in the flour
Add the flour and stir gently, about ten turns, just until the last streak of white disappears. Overmixing makes it chewy.
5. Add the chocolate
Drop the chocolate chips on top. Do not stir them in. They will sink on their own and leave a soft center.
6. Microwave on high
Cook on high for 60 seconds. The edges should look set and pull slightly from the mug, and the center should still look a little damp. If it is wet all over, give it 10 more seconds and check again.
7. Rest and eat
Let the mug sit on the counter for one minute. The center finishes setting in that time. Eat it warm with a spoon, straight from the mug.
Delicious Variations
Peanut butter swirl
drop a teaspoon of peanut butter on top before microwaving. It melts into a salty ribbon through the middle.
Mocha version
add a quarter teaspoon of instant coffee with the cocoa. It does not taste like coffee, it just makes the chocolate darker.
Gluten-free
swap the flour for the same amount of a one-to-one gluten-free blend. Add an extra teaspoon of milk, since those blends soak up more liquid.
Pro Tips
How to Store Easy Desserts
Refrigerator
A cooked mug cake is best eaten right away. If you have leftovers, cover the mug and refrigerate for up to two days. It will firm up and taste more like a brownie bite than a cake.
Freezer
You can freeze the cooked cake. Tip it out of the mug, wrap it tight, and freeze for up to one month. Thaw at room temperature for about an hour.
Reheating
Microwave the mug for 15 to 20 seconds on high. Anything longer and it goes rubbery. A splash of milk on top helps bring back the soft texture.
Frequently Asked Questions
Q: Why did my mug cake turn out rubbery?
You cooked it too long. Egg and flour set fast in a microwave, so 20 extra seconds is the difference between fudgy and bouncy. Next time pull it at 60 seconds while the center still looks slightly wet, then let it rest for a minute.
Q: Can I make a brownie mug cake without an egg?
Yes, use 3 tablespoons of milk and 1 extra tablespoon of flour in place of the egg. The texture is lighter and more like a steamed pudding than a fudgy brownie, but it works. It needs about 70 seconds instead of 60.
Q: Can I make this in the oven instead?
Yes, bake it in an oven-safe ramekin at 350F (175C) for 12 to 15 minutes. The center should still be soft when you pull it out. The microwave version is faster, but the oven one has a browner top.
Q: Why does my mug cake overflow?
The mug is too small or the batter is too full. Use a mug that holds at least 12 ounces and never fill it past halfway. A quick grease up the sides also helps it rise straight instead of climbing out.
Q: Can I use hot cocoa mix instead of cocoa powder?
It works in a pinch, but use 2 tablespoons and cut the sugar to 1 tablespoon, since cocoa mix is already sweetened. The result is sweeter and a little thinner in flavor than real cocoa powder.
Mix it in the mug, cook it for a minute, and eat it while it is still warm. If you make it tonight, come back and tell me whether you went with chocolate chips or peanut butter. Low and slow, friend.
Easy Desserts Recipe – Quick Weeknight Dinner Idea
This easy brownie mug cake is fudgy, chocolatey, and ready in about one minute in the microwave. One mug, a few pantry staples, no oven needed.
🧂 Ingredients
- 2 tablespoons (28g) unsalted butter
- 2 tablespoons (25g) granulated sugar
- 1 tablespoon (6g) unsweetened cocoa powder
- 1 large egg
- 3 tablespoons (24g) all-purpose flour
- 1/8 teaspoon salt
- 1 tablespoon (15g) chocolate chips
📋 Instructions
- 1Melt the butter — Put the butter in a 12-ounce mug and microwave on high for 20 to 30 seconds, until it is fully melted. Swirl it up the sides to grease the mug.
- 2Stir in sugar and cocoa — Add the sugar, cocoa, and salt. Stir with a fork until it looks like thick, glossy mud with no dry cocoa left.
- 3Beat in the egg — Crack in the egg and beat hard for about 20 seconds. The mixture should turn smooth and a shade lighter.
- 4Fold in the flour — Add the flour and stir gently, about ten turns, just until the last streak of white disappears. Overmixing makes it chewy.
- 5Add the chocolate — Drop the chocolate chips on top. Do not stir them in. They will sink on their own and leave a soft center.
- 6Microwave on high — Cook on high for 60 seconds. The edges should look set and pull slightly from the mug, and the center should still look a little damp. If it is wet all over, give it 10 more seconds and check again.
- 7Rest and eat — Let the mug sit on the counter for one minute. The center finishes setting in that time. Eat it warm with a spoon, straight from the mug.
