Add baking powder, baking soda, salt, cinnamon, nutmeg, egg, vanilla and pumpkin puree. Stir until combined.
Add flour and mix well.
Fold in Nutella, but avoid over mixing so you can see swirls in the dough.
Drop dough by heaping tablespoons on an ungreased cookie sheet.
Bake for 10-12 minutes, or until the tops are set.
Notes
To get fluffy, soft cookies, there are a few things you can do. (1) Warm your butter to room temperature (about 70℉). Butter should not be melted. Softening your butter will keep your doughs shape and prevent quick flattening when placed on the cookie sheet in the oven. (2) Use a cookie dough scoop to get the perfectly size cookies without rolling and squishing your dough.