Easy Chocolate Fudge

3 cups semisweet choc. Chips
1 can sweetened condensed milk (14 oz)
4 Tbsp butter
1 tsp vanilla extract
1/4 tsp salt

Line a 8 x 8 pan with foil and spray with non-stick spray. In a microwave safe bowl add chocolate chips, condensed milk and butter. Microwave on high for 1 minute. Stir well until all is melted and mixed. Add vanilla and salt and stir to mix. Spread evenly in the foil lined pan and cool in the refrigerator. When cooled completely, invert the pan on a counter and peel off the foil. Cut into squares.