Preheat your oven to 350° F. Spray a mini bundt cake pan with a nonstick spray, then set aside.
Mix cake mix, pumpkin puree and cinnamon together. Do not add any of the ingredients recommended on the cake mix box. Mix with electric mixer just until combined. The mixture will be very thick.
Spoon the mixture evenly into the mini bundt pan cavities, about 1/2 to 2/3 full. You can also place your cake batter into a piping back, and pipe the mixture into the bundt pan if desired.
Bake for 15 to 20 minutes or until a toothpick inserted comes out clean. Remove the cakes from the pan and allow them to cool completely on a wire rack
While the mini bundts are cooling, make the cream cheese frosting by creaming together the butter and cream cheese until light and creamy. Then add vanilla extract and powdered sugar, and mix until well combined and creamy. Divide the cream cheese frosting into 3 bowls. Mix the green food coloring into one, orange into another, and leave the third plain.
Once mini cakes are cool, trim the flat side of the cakes so that they are completely flat, this will help them fit together easily.
Spread a little of the plain frosting on the flat side of one cake andpress the flat side of another cake into it to create the pumpkin shape.
Melt the chocolate chips in a small microwave safe bowl for 30 seconds, then remove from microwave and stir well. If chocolate chips have not melted, heat for another 15 seconds, remove and stir again (often chocolate chips will melt when stirred). Repeat this process until chocolate is melted and smooth, but take care not to overheat the chocolate.
Dip the top of each wafer piece into the melted chocolate to make a stem, then place onto a sheet of parchment paper, wax paper or a silicone baking mat. Put those in the fridge for 5 minutes to harden.
Sprinkle some powdered sugar (optional) on the tops of the pumpkin cakes. Stick the wafer in the center of the top of the mini pumpkin bundt cake, with the chocolate side facing up. Fill up two piping bags with the green frosting and orange frosting. Using the colored frosting, pipe leaves and vines on the pumpkins and serve.