In microwavable bowl, (I prefer glass) mix chocolate chips and sweetened condensed milk. I put it in for 1 minute, remove and stir and put it back for another minute. Add 1 T. vanilla extract. It should be smooth and melted, pour it into an aluminum foil lined 8x8 pan. Put in the fridge for a couple hours to harden.
After its hardened, turn out on cutting board and remove aluminum foil. Cut into squares. (would probably need an adult for help on that)