Place butter and milk in a mug and cook them in the microwave for 30 seconds or until the butter is melted.
Place the brown sugar and vanilla extract in the mug and then mix in flour, chocolate chips and pinch of salt. Microwave for about 1 minute on HIGH. Allow to cool for 5 minutes before serving.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.