Chocolate chip cookie in a mug

Chocolate chip cookie in a mug

1 tbsp Butter
1/2 tbsp White Sugar
1/2 tbsp Brown Sugar
3 Drops of Vanilla Extract
1 Egg Yolk
Scant ¼ cup Plain Flour
2 tbsp Semi Sweet Chocolate Chips

Start by melting your butter in the microwave. Butter should just be melted, not boiling. Add sugars and vanilla. Stir to combine. Add the egg yolk. Stir to combine. Add flour, then stir again. Add the chocolate chips, and give a final stir. Now your mixture will look like cookie dough.
Cook in microwave 40-60 seconds (45 seconds came out perfectly).