There are evenings when the kitchen light is low and the day has been long, and what you want is not a whole cake. You want a small warmth in your hands. A mug, a spoon, a cookie that never has to leave the cup.
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This is that cookie. Butter melts into brown sugar, a single yolk binds it, and the microwave does in seventy seconds what an oven would take half an hour to do. The edges set. The middle stays soft, almost molten.
I make mine in the blue ceramic mug I have had for years. It holds the heat like a small stone in the sun. Eat it slowly. It is enough.
Why You'll Love This Recipe
About the Ingredients
2 tablespoons (28g) unsalted butter
Salted butter works too; simply skip the pinch of salt in the recipe. For a dairy-free version, use a plant butter stick, not a tub spread, since tubs contain too much water.
2 tablespoons (25g) packed light brown sugar
Dark brown sugar gives a deeper molasses flavor. If yours is hard as a stone, soften it with a slice of apple in the bag overnight.
1 tablespoon (12g) granulated sugar
Do not swap in a liquid sweetener like honey here; it changes the moisture and the cookie turns rubbery. Caster sugar is a fine stand-in.
1 large egg yolk
Save the white for an omelet or a small meringue. If you must skip the yolk, use 1 tablespoon of milk plus a teaspoon of oil, though the texture will be less rich.
1/4 teaspoon vanilla extract
Vanilla paste gives those lovely little seeds. In a pinch, a drop of maple syrup carries a similar warmth.
1/4 cup (30g) all-purpose flour
Spoon the flour into the cup and level it; a packed scoop makes the cookie dry. A 1:1 gluten-free baking blend substitutes directly.
2 tablespoons (15g) semisweet chocolate chips
Chop a piece of dark chocolate instead for pools rather than chips. Mini chips distribute more evenly in a small mug.
1 pinch fine sea salt
Just a few grains. Flaky salt scattered on top after cooking gives a lovely crunch against the soft middle.
Tips & Tricks
Use a wide mug
A mug at least 3.5 inches (9cm) across lets the cookie cook evenly instead of rising into a dome.
Watch the first cook
Microwaves vary wildly. Start at 60 seconds, then add 10-second bursts until the top looks just set.
Let it rest
Two minutes out of the microwave finishes the set and saves your tongue from the molten center.
Pro Tips
Step-by-Step Instructions
1. Melt the butter
Put the butter in a microwave-safe mug and heat in 15-second bursts at full power until just melted, about 30 to 45 seconds total. Swirl the mug so the sides are lightly greased.
2. Stir in the sugars
Add the brown sugar, granulated sugar, and salt. Stir for about 20 seconds until the mixture looks glossy and no sugar grains scrape against the spoon.
3. Beat in the yolk
Add the egg yolk and vanilla and stir briskly until the mixture is smooth and slightly pale, roughly 30 seconds. This step keeps the cookie from tasting eggy.
4. Fold the flour
Add the flour and stir gently just until no dry streaks remain, about 15 turns of the spoon. Stop there, because extra stirring toughens the crumb.
5. Add the chocolate
Fold in most of the chocolate chips, reserving a small pinch to press on top. The batter should look thick and slightly sticky.
6. Microwave the cookie
Cook at full power (about 1000 watts) for 60 seconds, then check. If the center still looks wet, add 10-second bursts up to 90 seconds total. It is done when the edges look set and slightly puffed and the center is glossy but no longer liquid, with an internal temperature near 190°F (88°C).
7. Rest and finish
Let the mug stand on the counter for 2 minutes so the center finishes setting. Scatter the reserved chocolate and a few flakes of salt on top, then eat warm with a spoon.
Delicious Variations
Peanut butter swirl
Drop in 1 tablespoon of peanut butter before cooking and drag a knife through it for ribbons.
Oatmeal raisin
Swap 1 tablespoon of the flour for rolled oats and use raisins in place of the chocolate.
Salted caramel
Press a soft caramel square into the center before microwaving and finish with flaky salt.
How to Store Microwave Mug Cookie
Refrigerator
Cover the mug and refrigerate for up to 2 days; the cookie firms considerably when cold.
Freezer
Not recommended, as the texture becomes dense and gummy after freezing.
Reheating
Sprinkle with a teaspoon of water, cover loosely, and microwave in 15-second bursts until warm and soft again.
Frequently Asked Questions
Q: Can you make a mug cookie without an egg?
Yes, you can replace the yolk with 1 tablespoon of milk and a teaspoon of neutral oil. The cookie will be a little less rich and slightly cakier, but it still works well.
Q: Why did my mug cookie turn out dry and rubbery?
Overcooking is almost always the cause, since microwaves keep cooking the cookie after the power stops. Cook in 60-second increments, stop while the center is still glossy, and let it rest for 2 minutes.
Q: Can I make this mug cookie in the oven instead?
Yes, bake it in an oven-safe ramekin at 350°F (175°C) for 12 to 15 minutes until the edges are golden and the center is just set. The microwave version is faster, but the oven gives a crisper edge.
Q: What size mug should I use for a mug cookie?
Use a microwave-safe mug of at least 12 ounces (350ml) with a wide opening, ideally 3.5 inches (9cm) across. A narrow mug forces the batter upward and can overflow.
Q: Is a mug cookie safe to eat if it looks underdone in the middle?
It is safe as long as the egg yolk reaches a set temperature, which happens within the cooking time given. For extra assurance, use a pasteurized egg or the egg-free variation.
Melt the butter, stir the sugar, and let the microwave hum for a minute. Then sit somewhere quiet with the warm mug in both hands and take the first soft spoonful. Less, but better.
Microwave Mug Cookie
This microwave mug cookie delivers a warm, gooey, buttery dessert in one mug in about five minutes, no oven and barely any cleanup required.
🧂 Ingredients
- 2 tablespoons (28g) unsalted butter
- 2 tablespoons (25g) packed light brown sugar
- 1 tablespoon (12g) granulated sugar
- 1 large egg yolk
- 1/4 teaspoon vanilla extract
- 1/4 cup (30g) all-purpose flour
- 2 tablespoons (15g) semisweet chocolate chips
- 1 pinch fine sea salt
📋 Instructions
- 1Melt the butter — Put the butter in a microwave-safe mug and heat in 15-second bursts at full power until just melted, about 30 to 45 seconds total. Swirl the mug so the sides are lightly greased.
- 2Stir in the sugars — Add the brown sugar, granulated sugar, and salt. Stir for about 20 seconds until the mixture looks glossy and no sugar grains scrape against the spoon.
- 3Beat in the yolk — Add the egg yolk and vanilla and stir briskly until the mixture is smooth and slightly pale, roughly 30 seconds. This step keeps the cookie from tasting eggy.
- 4Fold the flour — Add the flour and stir gently just until no dry streaks remain, about 15 turns of the spoon. Stop there, because extra stirring toughens the crumb.
- 5Add the chocolate — Fold in most of the chocolate chips, reserving a small pinch to press on top. The batter should look thick and slightly sticky.
- 6Microwave the cookie — Cook at full power (about 1000 watts) for 60 seconds, then check. If the center still looks wet, add 10-second bursts up to 90 seconds total. It is done when the edges look set and slightly puffed and the center is glossy but no longer liquid, with an internal temperature near 190°F (88°C).
- 7Rest and finish — Let the mug stand on the counter for 2 minutes so the center finishes setting. Scatter the reserved chocolate and a few flakes of salt on top, then eat warm with a spoon.
Ingrid explores Scandinavian minimalist design and slow living. She writes about creating calm, functional spaces with fewer, better things.
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