Step 1

To a mug, add the oil (or drippy nut butter), water, vanilla, ground flax, salt and sugar. Stir them up, then add the flour and baking soda. Stir together until everything is combined. Don't over-mix it. Then add the chocolate chips and stir gently again. If you used nut butter instead of oil, you might find that it's a bit too stiff to stir. If so add a teaspoon or 2 of water to loosen it up slightly.

Step 2

Smooth the top out a little then place the mug in a microwave and cook on high for 45 seconds. Leave to stand for 30 seconds to 1 minute before eating for optimum cookie texture.