In a large microwave-safe bowl, heat the white chocolate chips and sweetened condensed milk for 30 seconds. Stir well to combine.
Heat the mixture for another 30 seconds in the microwave, then stir again until the chocolate is fully melted and smooth.
Add the pumpkin puree, vanilla extract, and pumpkin pie spice to the melted chocolate mixture. Stir very well to ensure all ingredients are evenly incorporated.
Line an 8x8 inch glass baking dish with parchment or wax paper.
Pour the fudge mixture into the prepared pan, spreading it out evenly with a spatula.
Cover the pan and chill in the refrigerator for at least 4 hours, or until the fudge is fully set.
Once set, cut the fudge into squares and enjoy!
Notes
Be sure to microwave the chocolate chips and condensed milk in short bursts of 30 seconds. Stirring in between helps prevent the chocolate from overheating and burning.
If possible, use pumpkin puree that’s at room temperature. This helps it blend more easily with the melted chocolate and prevents it from cooling the mixture too quickly.
After pouring the fudge into the pan, use a spatula or the back of a spoon to smooth the top. This will give your fudge a clean, professional look once it’s set.
Be patient with the chilling process. Letting the fudge set in the fridge for at least 4 hours (or overnight) ensures it has the right texture and firmness.