Line a 9" x 9" pan with foil or parchment paper and mist. with cooking spray
Place chocolate chips and condensed milk in a bowl and combine.
Microwave for 1 minute and stir.
If the chocolate isn't smooth, microwave for another 30 seconds (as needed).
Fold in the vanilla until combined.
Pour smooth chocolate into the pan and refrigerate for at least an hour.
Cut into 1" x 1" squares and enjoy