Set the oven to 180 C / 350 F.
You will need a flat tray lined with baking paper and a food processor to mix them (see below for alternatives)
*Grind the chia seeds to a powder and mix with the water till thick and sticky. Chia seeds will resemble egg and go gloopy when water is added. (see substitute below)
Mix the gluten free flour, almond meal (flour) and baking powder and put into a food processor and blitz to combine. Add the butter, chia mixture and mix till a dough forms*
Roll out between two pieces of baking paper till very thin. Put the flattened dough onto the tray and transfer to the fridge and chill till firm. This will take about 20 minutes.
Cut into strips and then squares using a ruler. (I like the small square shapes but you could cut into any other shapes you want to use)
Bake for approx. 20 minutes or till golden. Cool on a cake rack until room temperature and then store in an airtight container.