World’s Best, Easiest, 5-Ingredient Mug Brownie

Okay, I know it’s been done to death, but this mug brownie is worth it. It’s fudgy and moist, and we share realistic tips on how to not get lumps. Only 5 ingredients! Perfect for a last minute Valentine’s treat!

World's Best, Easiest, 5-Ingredient Mug Brownie

Prep Time 5 minutes
Cook Time 1 minute
Total Time 6 minutes
Servings 1


  • 3 Tbsp sugar
  • 2 Tbsp flour
  • 1 ½ Tbsp cocoa powder
  • 2 Tbsp salted butter
  • 2 Tbsp 2% milk


  1. In a small bowl measure out sugar, flour, and cocoa powder.
  2. Add milk and butter to your mug and microwave 30 seconds. The butter should be almost completely melted.
  3. While the mug is in the microwave whisk the dry ingredients together. This will help break up lumps.
  4. Pour the milk and butter into the bowl with the dry ingredients. Whisk until combined, 30-60 seconds.
  5. Pour the mixture back into the mug, making sure to scrape the bowl.

  6. Microwave for 60 seconds. Center should look a bit molten, but when you tip the mug the brownie should not slide around. 

  7. If your brownie slides, microwave it in 5 second bursts until it stays still when tilted. Let it cool for about 2 minutes before eating.

Recipe Notes

  •  It may seem like a hassle to use a bowl for mixing, but you will get a much smoother brownie with no lumps. Trust me, you will spend more time trying to mix it in your tiny mug and you will end up frustrated and still have lumps. 
  • You do not need to sift your ingredients. Whisking them is enough to get a smooth batter.

I have tried a lot of mug brownies out there, and I decided there’s room for improvement. There has been way too much flour in every brownie recipe I tried; we’re not making a mug cake here, folks. Also, people use too many ingredients. You don’t need a pinch of salt when you use salted butter. You can’t taste a drop of vanilla so just leave it out. I don’t care for using part of an egg because I’m never going to remember to use up that partial egg in my fridge. The good news is leaving out the egg makes these even fudgier. We’ve broken it down to the basics. You’re welcome.

My husband is a brownie addict, so this recipe is dedicated to him. It’s such a fun treat and so easy to make. I just have to exercise self control to not make it too often.

The batter fills up about half of an 8 oz mug. It is the perfect size for one person with just enough room for ice cream or whipped cream if that’s your thing.

I had to double it up because I’m a food blogger and it looks pretty intense dripping down the sides like that. Not super realistic but definitely drool worthy.

And obviously you have to top it off with some ice cream, chocolate sauce, and a cherry. I would go for some caramel and nuts instead of that chocolate sauce. Just dreaming out loud.

We don’t normally keep ice cream in the house because then we eat ice cream every day. My husband told my daughter, “Thank mommy’s blog that we have ice cream.” To which she dutifully responded, “Thank you mommy’s blog.” My whole family loves you awesome readers! Thanks guys!


World's Best, Easiest, 5 Ingredient Mug Brownie – Get Hooked on Cooking – Okay, I know it's been done to death, but this mug brownie is worth it. It's fudgy and moist, and we share realistic tips on how to not get lumps. Only 5 ingredients! Perfect for a last minute Valentine's treat!

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