In a medium bowl, add chocolate chips and milk. Place in microwave and cook for 3 minutes at 50% power, stopping to stir every minute. If chips are not fully melted, microwave at 30 second increments so that the chocolate doesn't burn.
Remove from microwave and mix in salt, vanilla and nuts. Spread evenly in square pan.
Place pan in refrigerator to cool for 2 hours. When ready to remove fudge from pan, place bottom of square pan in a small amount of hot water to release fudge.
Store covered in refrigerator.
Recipe by CHIC AND SUGAR at https://www.chicandsugar.com/2015/01/grams-fool-proof-fudge/