Carefully whisk in the butter, pumpkin puree, maple syrup, pumpkin pie spice, and vanilla.
Pour your mixture into a prepared baking pan. You can either grease it with cooking spray or place a piece of parchment paper in it to help get the fudge out later.
Place your fudge in the refrigerator to chill and solidify, for about 3 hours.
Remove your fudge from the fridge and cut it into small squares to enjoy!