With a handheld or stand mixer fitted with a paddle attachment, beat the cream cheese and sugar together in a large bowl until creamy about 2 minutes.
Add the pumpkin and beat on high until combined. Add the graham cracker crumbs, pumpkin pie spice, cinnamon, and melted chocolate. Beat on medium speed for 2 minutes until everything is combined. The mixture is supposed to be soft and thick. Cover mixture tightly and refrigerate for 1 hour or up to 24 hours. Chilling is mandatory. Line two large baking sheets with parchment paper or silicone baking mats. Set aside.
Begin rolling chilled mixture into balls (about 1 teaspoon per ball) and place the balls on the baking sheets. You should have around 35 total. Chill balls in the refrigerator for 30 minutes or up to 24 hours.
During the last few minutes of the chilling time, begin melting the chocolate. You can melt the chocolate in a double boiler or the microwave. If using the microwave: place the chocolate in a medium heat-proof bowl. I like to use a liquid measuring cup. Its depth makes it easier for dipping the truffles. Melt in 30 second increments in the microwave, stirring after each increment until completely melted and smooth.
Let the warm chocolate sit for 5 minutes to slightly cool before dipping. Alternatively, you can temper the chocolate. If tempering, do not place or store truffles in the refrigerator.
Remove balls from the refrigerator and dip them in the chocolate using a dipping tool. When lifting the truffle out of the chocolate, remember to tap the dipping tool gently on the side of the bowl to allow excess chocolate to drip off. Top truffles with a sprinkle of graham cracker crumbs, if desired.
Place balls back onto the baking sheet after you dip each one. Allow chocolate to completely set in the refrigerator before serving. Truffles are OK at room temperature for a few hours for serving.
