Preheat oven to 400°F/205°C. Grease a deep ovenproof dish or tin (11"x7") with coconut oil.
Add oats, coconut oil, sugar, maple syrup and protein powder (if using) to a food processor and pulse until mixture is combined and comes away from the side of the jug.
Add in chocolate chips and pulse briefly to mix in.
Pour oatmeal mixture into your ovenproof dish, and use the back of a large wooden spoon to press it down.
Using a flat knife, score the mixture into 12 equal pieces.
Bake in the oven for 10-12 minutes until just turning golden.
Remove from the oven and immediately cut bars into 12 pieces along your scored lines.
Allow the bars to rest in their dish for 15 minutes in order to firm up (they will be very soft when they come out of the oven).
Turn onto a wire rack and allow to cool completely.