Sometimes you want a warm cookie right now, not a whole batch. This microwave mug cookie gives you a soft, gooey chocolate chip cookie in one mug in about five minutes. No mixer, no chilling dough, no leftover cookies tempting you all week.
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You stir the dough right in the mug, so there is almost nothing to clean up. The edges set while the middle stays soft and melty, like the center of a fresh-baked cookie. It is the perfect little dessert for one.
I make this on nights when I want something sweet but do not want to turn on the oven. Grab your favorite mug, and let's do this together.
Why You'll Love This Recipe
About the Ingredients
2 tablespoons (28g) unsalted butter
Melted butter gives the cookie its rich, tender crumb. If you only have salted butter, skip the added salt in this recipe.
2 tablespoons (25g) granulated sugar
White sugar sweetens and helps the cookie spread evenly. You can swap in light brown sugar for a deeper, chewier caramel flavor.
1 tablespoon (13g) packed light brown sugar
Brown sugar keeps the center moist and adds a hint of molasses. Dark brown sugar works too and tastes even richer.
1 large egg yolk
The yolk adds richness and structure in place of a whole egg. Save the white for an omelet, or use 1 tablespoon of milk if you are out of eggs.
1/4 teaspoon vanilla extract
Vanilla rounds out the flavor and makes it taste bakery-fresh. Imitation vanilla is fine here, so use what you have.
3 tablespoons (24g) all-purpose flour
Flour gives the cookie its body. For a gluten-free mug cookie, use a 1-to-1 gluten-free baking blend instead.
1/8 teaspoon baking soda
Baking soda helps the cookie rise slightly for a soft, tender texture. Do not skip it, or the cookie turns out dense and flat.
1/8 teaspoon fine salt
A pinch of salt balances the sweetness. If you used salted butter, leave this out.
2 tablespoons (30g) semi-sweet chocolate chips
Chocolate chips melt into gooey pockets of chocolate. Mini chips, chopped dark chocolate, or white chocolate chips all work great.
Tips & Tricks
Do not overcook it
Microwave in 15-second bursts after the first 40 seconds. A dry mug cookie usually just went 20 seconds too long.
Use a wide mug
A wide, shallow mug (about 12 ounces) cooks more evenly than a tall, narrow one. If your mug is narrow, add 10 extra seconds.
Watch the wattage
A 1000-watt microwave cooks faster than an 800-watt one. Start with 40 seconds, then add time in small bursts.
Pro Tips
Step-by-Step Instructions
1. Melt the butter
Add the butter to a 12-ounce microwave-safe mug. Microwave on high for 20 to 30 seconds at 1000 watts (or until fully melted, about 90F to 100F / 32C to 38C). The butter should be liquid with no solid pieces left.
2. Stir in the sugars
Add the granulated sugar and brown sugar to the melted butter. Stir with a fork for about 20 seconds until the mixture looks smooth and slightly glossy.
3. Add the wet ingredients
Stir in the egg yolk and vanilla extract until fully combined. The mixture should look creamy and even in color, with no streaks of yolk.
4. Fold in the dry ingredients
Add the flour, baking soda, and salt. Stir gently until just combined, about 15 seconds. A few small lumps are fine, but do not overmix or the cookie gets tough.
5. Add the chocolate chips
Fold in the chocolate chips, saving a few to press on top. The dough should be thick and scoopable, like soft cookie dough.
6. Microwave the cookie
Microwave on high for 40 seconds at 1000 watts (adjust to 50 to 60 seconds for an 800-watt microwave). It is done when the edges look set and slightly puffed and the center still looks a little glossy and wet, around 165F to 175F (74C to 79C) at the edge. If needed, microwave in 10-second bursts until the edges are set.
7. Rest and enjoy
Let the mug cookie rest for 1 minute; the center will finish setting and stay gooey. Top with the reserved chocolate chips or a small scoop of ice cream, and eat it warm with a spoon. The edges should be soft and golden, and the middle should pull slightly when you dig in.
Delicious Variations
Peanut Butter Chocolate
Stir 1 tablespoon of creamy peanut butter into the melted butter for a nutty, rich twist.
Oatmeal Raisin
Swap 1 tablespoon of the flour for 1 tablespoon of quick oats, and use raisins instead of chocolate chips.
S'mores Mug Cookie
Use 1 tablespoon of graham cracker crumbs in place of some flour, then top with mini marshmallows and a few chocolate chips before the last 10 seconds.
How to Store Microwave Mug Cookie
Refrigerator
Cover the mug with plastic wrap and refrigerate for up to 2 days. The cookie firms up when cold, which is normal.
Freezer
For the best texture, freeze the unbaked dough in a freezer-safe mug for up to 1 month. Microwave from frozen in 20-second bursts until warm and set.
Reheating
Reheat the baked cookie in the microwave for 10 to 15 seconds at a time until warm. Add a teaspoon of water to the mug to keep it from drying out.
Frequently Asked Questions
Q: Can I make a microwave mug cookie without eggs?
Yes, you can skip the egg yolk and use 1 tablespoon of milk, oat milk, or even water instead. The cookie will be a bit softer and less rich, but it still tastes great. Add 10 extra seconds of cook time if the center looks too wet.
Q: Why did my mug cookie turn out dry and rubbery?
It was almost certainly overcooked. Microwaves keep cooking food after the timer stops, so pull it out while the center still looks slightly wet. Start with 40 seconds and add time in 10-second bursts only if needed.
Q: Can I use a different mug or a small bowl?
Yes, any microwave-safe mug or small bowl works as long as it holds at least 12 ounces. A wider dish cooks faster and more evenly than a tall, narrow mug. If you use a narrow mug, add about 10 seconds of cook time.
Q: How many calories are in a microwave mug cookie?
This recipe has about 430 calories for the whole mug, since it is a single serving. That includes the butter, sugars, egg yolk, flour, and chocolate chips. You can lighten it by using 1 tablespoon of butter and 1 tablespoon of chocolate chips.
Q: Can I make this mug cookie gluten-free?
Yes, swap the all-purpose flour for an equal amount of a 1-to-1 gluten-free baking blend. The texture stays soft and gooey, and most people cannot tell the difference. Check that your baking blend already contains xanthan gum for the best result.
Grab your favorite mug and make this gooey microwave mug cookie tonight. It takes five minutes, and I promise it will hit the spot. If you try it, tell me what mix-ins you added. Here's to small steps, big impact.
Microwave Mug Cookie
Microwave Mug Cookie is a warm, gooey single-serve treat ready in 5 minutes, with melty chocolate chips and a soft center you can make anytime.
🧂 Ingredients
- 2 tablespoons (28g) unsalted butter
- 2 tablespoons (25g) granulated sugar
- 1 tablespoon (13g) packed light brown sugar
- 1 large egg yolk
- 1/4 teaspoon vanilla extract
- 3 tablespoons (24g) all-purpose flour
- 1/8 teaspoon baking soda
- 1/8 teaspoon fine salt
- 2 tablespoons (30g) semi-sweet chocolate chips
📋 Instructions
- 1Melt the butter — Add the butter to a 12-ounce microwave-safe mug. Microwave on high for 20 to 30 seconds at 1000 watts (or until fully melted, about 90F to 100F / 32C to 38C). The butter should be liquid with no solid pieces left.
- 2Stir in the sugars — Add the granulated sugar and brown sugar to the melted butter. Stir with a fork for about 20 seconds until the mixture looks smooth and slightly glossy.
- 3Add the wet ingredients — Stir in the egg yolk and vanilla extract until fully combined. The mixture should look creamy and even in color, with no streaks of yolk.
- 4Fold in the dry ingredients — Add the flour, baking soda, and salt. Stir gently until just combined, about 15 seconds. A few small lumps are fine, but do not overmix or the cookie gets tough.
- 5Add the chocolate chips — Fold in the chocolate chips, saving a few to press on top. The dough should be thick and scoopable, like soft cookie dough.
- 6Microwave the cookie — Microwave on high for 40 seconds at 1000 watts (adjust to 50 to 60 seconds for an 800-watt microwave). It is done when the edges look set and slightly puffed and the center still looks a little glossy and wet, around 165F to 175F (74C to 79C) at the edge. If needed, microwave in 10-second bursts until the edges are set.
- 7Rest and enjoy — Let the mug cookie rest for 1 minute; the center will finish setting and stay gooey. Top with the reserved chocolate chips or a small scoop of ice cream, and eat it warm with a spoon. The edges should be soft and golden, and the middle should pull slightly when you dig in.
Maya writes about sustainable living and zero-waste swaps for busy families. She focuses on small, actionable changes that fit into real life without judgment or guilt.
