Line an 8×8 inch baking pan with parchment paper.
Melt chocolate chips and butter in the microwave at 30-second intervals, stirring until smooth.
Stir in pumpkin puree, sweetened condensed milk, and vanilla extract until well combined.
Spread the fudge mixture evenly in the prepared pan.
Chill in the refrigerator for at least 2 hours until set.
Lift out using parchment and cut into squares.