Add the green chillis and oil to a food processor and blend until the green chillis are minced. This green chilli paste will more closely resemble minced chillis than "paste" which is fine. I prefer not to add water (as it will cause splatters) or other ingredients to this “paste.
You can either spoon the paste into this tiny cube silicone tray (each cube holds 1 teaspoon of volume) or you can store the paste in a ziplock bag, just be sure to flatten the paste into a thin layer so it is easy to break off.
I recommend using this tiny cube silicone tray to make 1 teaspoon cubes of chilli paste. You can also use it when making ginger paste or garlic paste.