Preheat oven to 350°F. In a mixing bowl of a stand mixer, combine sugar, oil, pumpkin and eggs. In a separate bowl, whisk together flour, baking powder, baking soda, cinnamon. Add flour mixture to the wet mixture and mix on high speed for about 5 minutes until batter is smooth and no clumps of flour remain.
Grease pumpkin pan. Spoon batter into each mold until about 1/2 full. Add 2 teaspoons of Nutella into the middle of each mold. Spoon more batter into each mold so that the Nutella is covered and molds are about 2/3 full.
Bake in preheated oven for approximately 15-20 minutes or until toothpick inserted on the side comes out clean. If you insert it where the Nutella is, only melted Nutella should cling to the toothpick and not uncooked batter.
After cakes have cooled, use green icing to pipe leaves on top. Decorate jack-o-lantern faces with edible black pen (see note).
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The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.