Place all of the ingredients in a large mixing bowl and mix to form to a medium-firm dough.
Sprinkle the surface with a little flour and scrape the dough out of the bowl onto the countertop. Knead the dough for about 5 minutes.
Preheat the oven to 180C | Gas Mark 4 and line a baking tray with baking parchment.
Roll the dough out to a thickness of around 2-3mm, then, using a pizza cutter or a biscuit cutter, cut the dough into rectangles.
Transfer onto the baking tray and bake in the middle of the oven 18-20 minutes. Let the crackers cool completely before serving.
Serve with a knob of butter.