Preheat oven to 350 F and prepare mini donut pan. Spray with oil. (I used Misto)
In a small bowl mix flour, baking powder, baking soda and cinnamon. Set aside.
In a powerful blender mix egg, butternut squash, melted butter, avocado oil, milk and vanilla extract.
Add sugar and mix well with a spoon.
Add dry ingredients and mix with spoon or spatula until all ingredients are incorporated well.
Put the batter into the bag, make a small hole on the corner. Push gently the batter into the baking pan and form mini donuts.
Bake for 10 - 13 minutes.