Break up graham crackers into pieces and add them to a food processor bowl. Pulse a few times until it forms a fine crumb.
In a mixing bowl, combine the graham cracker crumbs with the pumpkin puree, sugar, and cinnamon in a bowl. Mix until well combined.
Roll the pumpkin mixture into balls and place on a parchment-lined plate or baking sheet in the freezer for about 30 minutes. This will help them firm up.
Melt the chocolate chips in the microwave, using 30-second intervals and stirring thoroughly between each interval.
Roll each pumpkin truffle in the melted chocolate, using a spoon to roll them and fully coat them in chocolate. Use the spoon to remove each from the melted chocolate and return to the parchment-lined plate or baking sheet.
Place in the refrigerator for about 15-20 minutes, or until the chocolate hardens. Enjoy now, or place truffles in an airtight container and store in the fridge for up to 4-5 days.
Notes
If you prefer, you refrigerate the filling balls (rather than freeze) for several hours, then return to them later that day to coat in the chocolate.
Nutrition facts (approximate per truffle): 156 calories, 9.5 g fat, 5 g saturated fat, 45 mg sodium, 23 g carbohydrate, 3.5 g fiber, 14 g sugar, 2 g protein, Vitamin D: 0%, Calcium: 2%, Iron: 26%, Potassium: 4%