Quick Recipe Version (TL;DR)
Quick Ingredients
- 3 tbsp (24 g) all-purpose flour
- 3 tbsp (38 g) granulated sugar
- 2 tbsp (10 g) unsweetened cocoa powder
- 1/8 tsp baking powder
- 1/8 tsp fine salt
- 2 tbsp (30 ml) milk
- 1 1/2 tbsp (22 ml) neutral oil or melted unsalted butter
- 1/4 tsp vanilla extract
- 1 1/2 tbsp (about 25 g) semisweet chocolate chips, plus 1 tsp for topping
- Pinch flaky salt (about 1/16 tsp), for finishing
- Optional: 1/2 cup (about 70 g) vanilla ice cream, to serve
Do This
- 1. In a microwave-safe mug (12–16 oz), whisk flour, sugar, cocoa, baking powder, and fine salt.
- 2. Add milk, oil (or melted butter), and vanilla; whisk until smooth and glossy.
- 3. Stir in chocolate chips; sprinkle a few on top.
- 4. Microwave on HIGH for 60 seconds.
- 5. Check doneness; microwave 10–15 seconds more as needed (up to 90 seconds total) until edges look set and the center is still slightly soft.
- 6. Rest 2 minutes (it finishes cooking as it cools).
- 7. Finish with flaky salt; add ice cream if you want the classic brownie-and-ice-cream vibe.
Why You’ll Love This Recipe
- Fast comfort dessert: real brownie satisfaction in minutes, no oven needed.
- Fudgy, cocoa-rich texture: gooey middle with chocolate chip pockets that melt into the batter.
- One-mug cleanup: mix, cook, and eat from the same mug.
- Easy to customize: swap mix-ins, adjust cook time for extra gooey or more set.
Grocery List
- Produce: none (optional: strawberries or raspberries for serving)
- Dairy: milk; unsalted butter (if using instead of oil); vanilla ice cream (optional)
- Pantry: all-purpose flour; granulated sugar; unsweetened cocoa powder; baking powder; fine salt; flaky salt; neutral oil; vanilla extract; semisweet chocolate chips
Full Ingredients
Dry Ingredients
- All-purpose flour: 3 tbsp (24 g)
- Granulated sugar: 3 tbsp (38 g)
- Unsweetened cocoa powder: 2 tbsp (10 g)
- Baking powder: 1/8 tsp
- Fine salt: 1/8 tsp
Wet Ingredients
- Milk: 2 tbsp (30 ml)
- Neutral oil (canola/vegetable/avocado) or melted unsalted butter: 1 1/2 tbsp (22 ml)
- Vanilla extract: 1/4 tsp
Mix-Ins & Toppings
- Semisweet chocolate chips: 1 1/2 tbsp (about 25 g), plus 1 tsp for topping
- Flaky salt: 1 pinch (about 1/16 tsp), for finishing
- Optional for serving: vanilla ice cream, 1/2 cup (about 70 g)
Step-by-Step Instructions
Step 1: Choose the right mug
Use a microwave-safe 12–16 oz (350–475 ml) mug so the batter has room to rise without overflowing. If your mug is smaller, reduce the recipe by about one-third or cook in a slightly larger bowl.
Step 2: Mix the dry ingredients thoroughly
Add the flour, sugar, cocoa powder, baking powder, and fine salt directly to the mug. Whisk with a fork or small whisk until the cocoa is evenly distributed and you don’t see streaks. This quick dry mix prevents bitter cocoa clumps later.
Step 3: Add the wet ingredients and whisk until smooth
Pour in the milk, oil (or melted butter), and vanilla extract. Whisk briskly until the batter is smooth, glossy, and thick—about 20–30 seconds. Scrape the bottom and corners of the mug to make sure no dry pockets remain.
Tip: Stop mixing as soon as the batter is smooth. Overmixing can make the brownie a little tougher.
Step 4: Stir in chocolate chips (save a few for the top)
Stir in the chocolate chips, then sprinkle about 1 tsp over the surface. Those top chips melt into gooey puddles and also help you visually judge doneness.
Step 5: Microwave in short bursts for a fudgy center
Microwave on HIGH (100% power) for 60 seconds. The brownie should look set around the edges but still slightly soft and shiny in the center.
If it looks very wet in the middle, continue microwaving in 10–15 second bursts until the edges are set and the center is just a bit underdone, for a fudgy texture. Most microwaves land between 60 and 90 seconds total.
Temperature note (optional if you like to check): For a fudgy brownie, aim for about 185–195°F (85–90°C) in the center. Higher than that can push it toward cakey and dry.
Step 6: Let it rest to finish cooking
Let the mug brownie rest on the counter for 2 minutes. The residual heat will continue to set the center. This resting step is the secret to a brownie texture instead of a hot, loose batter.
Step 7: Finish with flaky salt and serve
Sprinkle a pinch of flaky salt over the top. Serve warm straight from the mug, or add 1/2 cup vanilla ice cream for that classic hot-and-cold contrast.
Pro Tips
- Under-cook slightly, then rest: The brownie keeps cooking after the microwave stops. Pull it when the center is still a little soft for the fudgiest result.
- Know your microwave: Times vary a lot. Start with 60 seconds, then add short bursts. It’s easy to add time; you can’t undo overcooking.
- Oil vs. butter: Oil tends to produce a slightly fudgier, moister brownie; melted butter gives a richer, more classic brownie flavor.
- Mix well, but don’t beat: Whisk until smooth, then stop. Overmixing can make the texture tougher.
- Prevent overflow: Use a 12–16 oz mug, and keep the batter below halfway up the mug if possible.
Variations
- Peanut butter swirl: Dot 1 tbsp peanut butter on top of the batter and gently swirl with a toothpick before microwaving.
- Mint chocolate: Add 1/8 tsp peppermint extract (in addition to the vanilla) and use dark chocolate chips.
- Mocha brownie: Add 1 tsp instant espresso powder to the dry ingredients to deepen the chocolate flavor.
Storage & Make-Ahead
This mug brownie is best eaten warm right after resting. If you do have leftovers, cover the mug tightly and store at room temperature for up to 1 day or refrigerate for up to 2 days (it will firm up). Reheat gently in the microwave for 10–15 seconds to soften the center again.
Make-ahead idea: Pre-mix the dry ingredients (flour, sugar, cocoa, baking powder, salt) in a small jar or bag. When the craving hits, add the wet ingredients and chocolate chips and microwave.
Nutrition (per serving)
Approximate, for 1 mug brownie without ice cream: 560 calories, 30 g fat, 72 g carbs, 7 g protein, 4 g fiber, 260 mg sodium. (Ice cream will add additional calories and sugar.)
