This quick treat is only 100 calories for a fudgy mug brownie!
When you want a small chocolate fix without overindulging, this single-serving mug brownie is the perfect solution. It’s simple to make, takes only minutes, and clocks in at about 100 calories per serving.

I tested several boxed brownie and cake mixes and measured portions to stay within daily calorie goals. For most mixes, 2 tablespoons of dry mix equal roughly 100 calories. That makes it easy to portion a single mug brownie (or mug cake) without guesswork.
This portion-control trick has saved me more than once when I wanted a treat but didn’t want a pan of brownies sitting around. The key with this mug brownie is to enjoy it immediately: it’s best hot and fresh from the microwave. Right out of the oven it’s rich, fudgy, and chewy. Left to sit, however, it will quickly firm up and become rubbery, so plan to eat it right away.
The Mug Brownie Recipe

100 Calorie Mug Brownie
Equipment
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microwave
Ingredients
- 2 tablespoons dry brownie mix
- 1 tablespoon water
Instructions
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Measure 2 tablespoons of dry brownie mix (about 100 calories) from a boxed mix when you want a single serving.
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Spray a large microwave-safe mug with cooking spray.
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Add the 2 tablespoons of brownie mix to the mug. Stir in water, a teaspoon at a time, until the batter becomes thick but pourable.
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Microwave on high for 60 seconds.
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Check doneness and microwave an additional 20–30 seconds if needed.
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Serve immediately. The brownie will be fudgy and chewy when hot; it firms up if it cools.
Nutrition
If you like a little extra, adding about 20 calories of whipped topping makes this even more indulgent without adding much to the total. It’s a tasty option if you don’t need to be strict with every last calorie.

Give these quick mug brownies a try and let me know how you like them—perfect for a fast, portion-controlled dessert.
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If you like this, you might also like
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- Low Calorie Mug Cake Recipe
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- Microwave Protein Mug Cakes