Preheat oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.

In a large bowl, combine cake mix, pumpkin puree, oil, and eggs. Beat with an electric mixer on medium speed for 2 minutes.

Pour batter into prepared pan and bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.

Let cake cool completely in the pan before crumbling it into a large bowl.

Add softened butter to the crumbled cake and mix well until a dough-like consistency is achieved. If too dry, add a tablespoon of milk or pumpkin puree at a time.

Roll mixture into 1-inch balls. Melt chocolate chips in a double boiler or microwave-safe bowl.

Insert a toothpick into each cake ball and dip into melted chocolate, coating completely. Add optional toppings immediately.

Place coated cake balls on wax paper-lined baking sheet and let chocolate set for about 30 minutes. Remove toothpicks before serving.