Melt the white chocolate chips in a microwave safe bowl in 30 second intervals. Stir in between each 30 seconds until chocolate is completely melted.
Pour the sweetened condensed milk into the melted chocolate. Be prepared to stir quickly as the texture will change rapidly. Add in the pumpkin puree and pumpkin pie spice to the mixing bowl and mix until the white chocolate pumpkin mixture is smooth.
Pour the pumpkin mixture into a parchment paper lined 8X8 baking pan. Place in the refrigerator for 4-6 hours or overnight until the fudge is set.
Once set and firm, remove the fudge from the baking pan and peel away the parchment paper. Cut into squares and serve.
Notes
Store in the refrigerator in an air tight container or freeze extras.
Do not use off-brand white chocolate as they have variable melting properties and the recipe may not work properly.
You may be tempted to add more pumpkin puree but don't! If will change the consistency of the fudge and it won't set the same.