Line an 8x8 inch square baking pan with parchment paper, leaving an overhang on the sides for easy removal.

In a medium microwave-safe bowl, combine the chocolate chips and sweetened condensed milk.

Microwave on high for 1 minute, then let sit for 1 minute to allow the residual heat to melt the chips.

Stir the mixture until completely smooth. If chips are not fully melted, microwave in additional 15-second intervals, stirring after each.

Stir in the vanilla extract and salt until well incorporated.

Pour the mixture into the prepared baking pan and spread evenly with a spatula.

Refrigerate for at least 2 hours or until firm.

Lift the fudge out of the pan using the parchment paper overhang and cut into 1-inch squares.