This single-serving, deep-dish chocolate chip cookie in a mug is wonderfully gooey and delicious. Ready in under five minutes, it’s dangerously easy to make and perfect when you need a quick sweet treat. 
Have you ever found yourself craving something sweet late at night when a healthy snack just won’t do? This mug cookie answers that craving. It’s a soft, extra-moist chocolate chip cookie made right in a mug and “baked” in the microwave.
Because it’s made in the microwave, it’s ready in minutes and is especially delicious served warm with a scoop of ice cream that melts into the hot chocolate chips.
How to Make a Chocolate Chip Cookie in the Microwave
This mug method reliably produces a chewy, deep-dish cookie. I tested shaping dough into balls and microwaving them, but the mug method gives far better results. The recipe is similar to a mug cake but uses different ingredient ratios so the texture is chewy rather than cake-like.
Ingredients:
- 1 1/2 tablespoons butter
- 2 tablespoons brown sugar
- 1 large egg yolk (discard the white)
- 1/8 teaspoon vanilla extract
- 3 tablespoons all-purpose flour
- pinch of salt (optional)
- 2 tablespoons chocolate chips
Brown sugar adds more depth of flavor, but white sugar can be used if needed. I tested the recipe with both milk and egg yolk for moisture; the egg yolk produces a moister, chewier cookie. If you prefer not to use an egg yolk, replace it with 1 tablespoon of milk.
Step-by-step:
- Place the butter in a large mug and microwave until melted.
- Remove the mug and whisk in the brown sugar (a fork works well).
- Let the butter cool slightly so it won’t scramble the egg, then whisk in the egg yolk and vanilla extract.
- Stir in the flour and a pinch of salt until the mixture is thick, like cookie dough. Fold in the chocolate chips.
- Microwave on medium power (50–70%) for 60–90 seconds, checking after 60 seconds. The top should look just set. Avoid high power, which can overcook the cookie and scorch the chocolate.
- Serve immediately, optionally topped with a scoop of vanilla ice cream.
It’s better to undercook slightly so the cookie stays moist and gooey instead of drying out. This single-serving mug cookie is quick, simple, and satisfying whenever you want a warm chocolate chip treat. 
For quick reference, here are the recipe details:
Chocolate Chip Cookie in a Mug
Ingredients
- 1 1/2 tablespoons butter
- 2 tablespoons brown sugar
- 1 large egg yolk discard the white
- 1/8 teaspoon vanilla extract
- 3 tablespoons all-purpose flour
- 2 tablespoons chocolate chips
Instructions
- Add the butter to a large mug and microwave until melted.
- Remove from the microwave and whisk in the brown sugar.
- Let the butter cool slightly, then whisk in the egg yolk and vanilla extract.
- Stir in the flour until the mixture is thick like cookie dough, then fold in the chocolate chips.
- Microwave on medium power (50–70%) for 60–90 seconds, checking after 60 seconds. The top should look just set—do not use high power.
- Enjoy immediately, optionally with a scoop of ice cream.
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