Preheat the oven to 150°C/130°C fan-forced. Line 2 baking trays with baking paper.
Combine flour, oats, coconut, chia seeds and sugar in a medium bowl.
Melt butter, golden syrup and water in a saucepan over low heat. Add bicarbonate of soda (the mixture will foam). Pour into the oat mixture and stir to combine.
Roll of tablespoons of mixture into balls and place on prepared baking tray. Leave room for spreading while cooking. Flatten each ball with fingertips until about 5mm thick.
Bake for 15-20 minutes. Remove from the trays carefully and cool on wire racks.