Place chocolate into a heat-proof bowl and drop butter on top.
Warm cream in a saucepan over medium-low heat to a simmer, just below boiling. Remove from heat and pour hot cream evenly over chopped chocolate and butter. Allow to sit for 5 minutes.
Stir chocolate until melted. Add vanilla extract and continue stirring until chocolate is completely melted. Pour chocolate into a flat and shallow dish. Freeze for 1 hour or place refrigerate for 1 to 2 hours.
Mix pumpkin pie spice with sugar in a small bowl. Scoop the set chocolate mixture into mounds the size of 1 to 2 teaspoons. Roll into balls and then roll into pumpkin pie spice mixture. Refrigerate until ready to serve.