Preheat oven to 210 C (410 F) and line a baking tray with baking paper.
Mix flour and baking soda together. Add greek yoghurt and form into a dough.
Use a rolling pin to roll dough out on a lightly floured surface until it is roughly square shaped and about half a cm thick. Cut edges straight with a knife.
Thinly spread entire surface with tomato paste, then sprinkle evenly with bacon, zucchini and cheese.
Tightly roll into a log shape and gently press the outer edge into the rest so it sticks closed.
Gently cut into 1cm thick scrolls
Lay flat on prepared baking tray and bake for approx 22 mins.