Add the coconut flour, ground flaxseed, salt, oregano and xanthan gum to a mixing bowl. Mix together well until combined.
Add the olive oil and a little water to the bowl. Use your hands to start to bring the mixture together. Add a little more water until it is all fully incorporated and you have a dough consistency. Set aside for 10 minutes to rest and allow the flax and coconut flour to absorb all the water. If after this time the dough feels a little dry, add more water a little at a time until you have a smooth, shapeable dough.
Preheat the oven to 400 degrees Fahrenheit. Cut a large square of baking paper and lay it on a clean work surface. Turn the dough out into the middle of the paper. The dough should not be too sticky, so you can press it into your base shape with your hands, creating a circle about 1/4 inch thick. Alternatively place a second piece of baking paper over the top of the dough and use a rolling pin to roll into shape.
Carefully transfer the dough base, on the baking parchment, to a large oven tray. Place in the oven to bake for 10 minutes until lightly golden and starting to firm. After this time you can layer your base with your selected toppings, then return to the oven to cook for a further 5-10 minutes until your base and toppings are hot through.