Prepare your pan: Line an 8×8 inch baking dish with parchment paper, leaving some overhang on the sides for easy removal.
Melt the ingredients: In a medium saucepan over low heat, combine the sweetened condensed milk, pumpkin puree, and chocolate chips. Stir continuously until melted and fully blended.
Add flavor: Remove from heat and stir in the vanilla extract and pumpkin pie spice until well combined.
Pour and spread: Pour the mixture into the prepared baking dish, spreading it evenly. Smooth the top with a spatula.
Chill: Refrigerate the fudge for at least 2 hours or until firm.
Cut and serve: Once firm, use the overhanging parchment to lift the fudge out of the pan. Cut into 1-inch squares and enjoy!