Making your Microwave Mug Cookie is straightforward! Follow these steps:

1. Melt the Butter: In a microwave-safe mug, melt the butter for about 20-30 seconds.

2. Add Sugars: Stir in the granulated sugar and brown sugar until well combined.

3. Mix in Vanilla and Salt: Add the vanilla extract and a pinch of salt, mixing thoroughly.

4. Incorporate Egg Yolk: Add the egg yolk and mix until fully incorporated.

5. Add Flour: Gradually stir in the all-purpose flour until the mixture is smooth and combined.

6. Fold in Chocolate Chips: Add the chocolate chips (or other mix-ins) and stir gently.

7. Microwave: Place the mug in the microwave and cook for about 40-60 seconds. Start with 40 seconds and check for doneness. The cookie should be set but still soft.

8. Cool Slightly: Allow the mug to cool for a minute before enjoying.