Line 8×8 or 9×9 baking dish with foil, then spray foil with Pam. (allow a little extra foil on the sides, so the fudge can be easily be lifted out later)
In large microwave-safe bowl, combine chocolate chips and sweetened condensed milk.
Microwave for 1 minute, then give it a quick stir.
Microwave for an additional 45 seconds, and stir until melted. (Or microwave for an additional 45 seconds if you need)
Once melted, quickly transfer to foil lined baking dish and spread out evenly. (the fudge sets fast here, so devote your full attention)
Sprinkle top of mixture with in pan evenly with 1/2 cup chopped pecans.
Transfer to refrigerator, and chill for about 2 hours, or until set.