Into the bowl of a stand mixer (or using a hand mixer), combine oil and sugar and "whisk" for about 30 seconds.
Add vanilla extract, eggs and mix at medium speed for about 2 or 3 minutes until slightly foamy.
Now add pumpkin purée and mix for 30 seconds.
Add sifted flour, cinnamon powder, coffee powder (I've used something similar to this), salt, baking powder and baking soda and mix at low speed until JUST COMBINED. Do not over-mix, you don't want tough muffins.
Now add chocolate chips and stir with a spatula.
Fill muffin cases two-thirds full (or full - like I did - for bigger muffins), bake for about 30-35 minutes, until risen (depends on the oven).
Optional: frost with cream cheese frosting and add a drop of caramel!