Preheat the oven to 200 degrees Fan
Place the flour, salt, sugar, garlic powder and oregano into a bowl
Add the tomato puree, oil and water and mix to form a soft dough
Knead briefly to make a smooth dough
Roll out between two sheets of parchment until it's 2mm thick
Cut into squares, this is easiest with a pizza roller
Prick each square with a fork or cake tester
Brush with water and sprinkle over some flaky sea salt and more oregano
Scatter with vegan Parmesan if liked
Transfer to the lined baking sheet and bake for 12-15 minutes until golden.
These keep well for up to a week, if they last that long!