

Place the salted butter in a microwave-safe mug and melt it in the microwave for about 20 seconds.
Once the butter is melted, add the sugar and brown sugar to the mug. Stir well to combine.
Add the egg yolk and vanilla essence to the mug. Stir until everything is well incorporated.
Gradually add the heat-treated flour to the mug, stirring continuously to prevent any lumps from forming.
Once the flour is fully incorporated, fold in the chocolate drops.
Decorate the top of the cookie dough with additional chocolate drops, if desired.
Place the mug in the microwave and cook the cookie on high power (about 500 watts) for 40 to 50 seconds.
Carefully remove the mug from the microwave (it will be hot!) and allow the cookie to cool slightly before enjoying it directly from the mug.
Grab a spoon and dig into this warm and gooey microwave mug cookie for a quick and delicious treat!