Break up graham crackers and add them to the food processor. Pulse a few times until it forms a fine crumb.
Combine graham cracker crumbs with pumpkin puree, sugar, and cinnamon in a bowl. Mix until smooth.
Roll mixture into balls and place on a baking sheet in the freezer for about 30 minutes (you could also pop them in the fridge if you want to come back to them later on). Cooling will help them firm up a bit.
Melt the chocolate chips in the microwave. The easiest way to ensure non-burnt chocolate is to place them in for 20 second intervals, then remove and stir before placing back in for another interval. It only took mine a little over a minute total to fully melt.
Roll each pumpkin truffle in the melted chocolate and return to the baking sheet. Place in the freezer for 15 minutes so chocolate hardens. Eat now, or place truffles in an airtight container and store in the fridge for several days!
Notes
Nutrition facts (approximate per truffle):158 calories, 6 g fat, 4 g sat fat, 59 mg sodium, 24 g carbohydrate, 2 g fiber, 19 g sugar, 2 g protein, Vitamin A: 32%, Vitamin C: 1%, Calcium: 1%, Iron: 6%