Place the butter in a bowl or glass or measuring cup and melt the butter for 20-30 seconds or until melted.
Stir in the brown sugar until throughly combined.
Stir in the vanilla, salt, milk and flour until combined then stir in the chocolate chips.
Place the cookie dough on a microwave safe plate and form into an even circle.
Microwave cookie for 30 seconds. Microwave an additional 30 seconds. Microwave another 20-30 seconds or until cookie dough looks dry to the touch and chocolate is bubbly.
Eat immediately with a spoon or allow the cookie to cool about 1-2 minutes before transferring to a wire rack.