Step 1

Line a 9" by 9" pan with foil and spray with non-stick cooking spray.

Step 2

Place chocolate chips in microwave safe bowl. Pour sweetened condensed milk over the chocolate chips.

Step 3

Microwave on high for 60 seconds. Stir well.

Step 4

Microwave on high for 60 more seconds. Stir well again.

Step 5

If the chocolate chips are not completely melted, continue to microwave at 30 second intervals until chocolate is completely melted.

Step 6

Add chopped walnuts (if using) and stir completely.

Step 7

Pour fudge into prepared pan.

Step 8

Refrigerated for an hour or until completely hardened.

Step 9

Lift foil out of pan and cut into cubes.