Desserts · American
Fudgy Mug Brownie in 5 Minutes
Sometimes you want one brownie, not a pan of twelve staring at you all weekend. This one mixes in the mug, cooks in the microwave, and goes from craving to fork in about 5 minutes.
The clock is simple. Three minutes to stir flour, sugar, cocoa, oil, and milk together with a fork. About 60 to 90 seconds in the microwave on a 900 to 1000 watt machine, then a 30 second rest to settle, and that rest is part of the honest 2 minutes of cook time. The edges come out set and the middle stays fudgy, if you pull it at the right moment, and the right moment is written down below.
Use a 12 oz (360 ml) mug or bigger. The batter rises in the microwave, and a small mug will bubble over, which is a tragedy to clean.
By the TasteBoard team. Timed in a home kitchen, with total time added up and safe temperatures checked.
Photo: @Miamistill / Wikimedia Commons, CC BY-SA 4.0
- 30 min promise
- 5 min total
- Prep
- 3 min
- Cook
- 2 min
- Total
- 5 min
- Servings
- 1
- Course
- Desserts
- Calories, about
- 480 per serving
Instructions
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Why you will love it
One brownie, about 5 minutes, no oven preheating, no pan to wash.
Mixed and cooked in the same 12 oz mug, one fork to clean.
Set edges with a fudgy middle, the ratio people chase in pan brownies.
The doneness cue is written for 900 to 1000 watt microwaves, with a note for lower wattage.
No eggs in the batter, so there is no worry about an underdone center.
Tips
Undercook on purpose. A mug brownie that looks fully done in the microwave is dry by the time it cools. Pull it while the center still glistens.
The 30 second rest is not optional, it is what turns a wet middle into a fudgy one.
On a 700 watt microwave, cook for 90 to 110 seconds total. Lower wattage just takes longer, the cue stays the same.
Eat it warm. A mug brownie at room temperature is a different, sadder dessert, and that is the honest truth.
Swaps and variations
Peanut butter swirl: drop 1 tbsp (16 g) peanut butter on top of the batter before microwaving and swirl it with the fork. What changes: a peanut butter ribbon through the middle and a slightly denser crumb.
Espresso version: add 0.25 tsp instant coffee granules with the dry ingredients. What changes: the chocolate tastes deeper and darker, with no real coffee flavor.
Double chocolate: increase the chips to 2 tbsp (20 g). What changes: pockets of melted chocolate, and about 50 extra calories.
What to serve
A scoop of vanilla ice cream dropped right into the mug, which turns it into a proper dessert for one.
Cold milk alongside, the classic brownie pairing.
A few raspberries on top, tart against all that chocolate.
Storage and reheating
This recipe is one serving, eaten warm within about 20 minutes, that is its whole personality. If somehow half survives, cover the mug and keep it for 1 day, then microwave for 10 to 15 seconds to soften it back up. It will be more cakey than fresh. Freezing is not worth it, a thawed mug brownie is dry and rubbery, and making a fresh one takes 5 minutes anyway, which is the entire point.
Calories shown are an estimate from standard ingredients, not medical advice. Brands and amounts change the number.
Questions cooks actually ask
What wattage does this timing work for?
It is written for a 900 to 1000 watt microwave, which covers most modern machines. On a 700 watt machine, cook for 90 to 110 seconds and use the same visual cue, a set top with a glossy, slightly wet looking center.
Can I double it in one mug?
I would not. A doubled batch overflows most mugs, and the middle stays raw while the edges turn dry. If you need two servings, make two mugs, that is the honest method.
Why is mine dry and cakey?
It overcooked. Mug brownies go from fudgy to dry in about 15 seconds of extra microwaving, so pull it early and let the 30 second rest finish the middle. Err on the side of glossy.
How big is this serving?
One 12 oz mug, one generous brownie, about 480 calories as an estimate. If that is more than you want, split it with someone, it spoons out easily while warm.
Can I use a smaller mug?
No, 12 oz (360 ml) is the minimum. The batter can climb close to the rim while it cooks, and a smaller mug means an overflow mess in your microwave.
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