Late-Night Brownie Mug Cake

When the chocolate craving shows up after dinner, this little mug cake does not ask you to make a whole batch. It is fudgy, warm, intensely chocolatey, and ready before you can finish arguing with yourself about whether dessert counts as dinner.

Recipe at a Glance

Prep: 3 minutes · Cook: 60 to 80 seconds · Bake: None · Chill: None · Rest: 1 to 2 minutes · Total: 5 minutes · Servings: 1 · Difficulty: Easy

Ingredients

4 tbsp flour
4 tbsp sugar
2 tbsp cocoa powder
Pinch salt
3 tbsp milk
2 tbsp neutral oil
1 tbsp chocolate chips

How to Make It

Choose a microwave-safe mug with enough room for the batter to rise. Add the flour, sugar, cocoa powder, and salt directly to the mug. Stir well so the cocoa is evenly distributed.
Pour in the milk and oil. Stir with a small whisk or spoon until you have a smooth batter. Scrape the bottom and corners of the mug because dry flour hiding there can turn into little pockets after microwaving.
Press the chocolate chips into the center of the batter. Keeping them mostly in the middle gives you a softer, melty chocolate center.
Microwave for 60 to 80 seconds. Start at 60 seconds if your microwave is powerful. The top should look set while the center still looks slightly glossy and fudgy.
Let it stand for 1 to 2 minutes before digging in. Serve warm, plain or with ice cream.

Tips and Troubleshooting

Dry cake: You probably cooked it too long. Microwave power varies, so start with the shorter time and add a few seconds only if needed.
Raw batter around the edges: Make sure the dry ingredients were fully incorporated and that the mug is microwave-safe.
Rubbery texture: Overcooking is the usual culprit. This recipe is supposed to stay slightly glossy in the center.
Cocoa clumps: Mix the flour, sugar, cocoa, and salt thoroughly before adding milk and oil.

Substitutions

Use dairy-free milk and dairy-free chocolate chips for a dairy-free version.
Use a 1:1 gluten-free flour blend for a gluten-free version.
Use your preferred neutral-flavored oil. Avoid strongly flavored oils that compete with the chocolate.

Storage and Reheating

This dessert is best fresh because the fudgy texture is at its peak right after cooking. If it cools before you finish it, reheat for about 10 seconds. Freezing is not recommended for this single-serving recipe.

Frequently Asked Questions

Can I make the dry mix ahead?

Yes. Measure the flour, sugar, cocoa, and salt into the mug ahead of time, then add the milk and oil when you are ready to cook it.

Why is my mug cake not fudgy?

The most common reason is overcooking. Look for a set top with a slightly glossy center rather than waiting for the entire cake to look dry.

Can I add more chocolate?

You can, but keep the existing 1 tablespoon measurement if you want to stay close to the tested recipe. Extra chips can make the center much softer.

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Make Your Mug Cake Turn Out Fudgy

Choose a mug with room for the batter to rise.
Mix the dry ingredients thoroughly before adding the milk and oil.
Start with the shorter microwave time, then add only a few seconds if needed.
Let the cake stand briefly before eating so the center finishes setting.

More Sweet Pea Desserts

For another chocolate treat, try Copycat Crumbl Chocolate Chip Cookies or The Perfect Chocolate Chip Cookie. For a chilled make-ahead dessert, try Biscoff Cheesecake with Blueberry Syrup. Browse Desserts, use What Should I Make?, or plan around Recipes by Budget and the $50 Grocery Challenge.