Take off the heat and stir in the coconut, puffed rice and oats. Scrape the mixture into a lined 10 x 7-inch or 9-inch square tin. Gently spread it out with your hands and press down quite firmly to pack the mixture together. Quickly sprinkle over the chocolate chips and push them down a bit, then leave to cool (I put mine in the fridge for 30 minutes, but you can leave them at room temperature). Cut into 10-16 bars or squares. Store in an airtight container.