Mix flour, oat flakes, sesame seeds, sunflower seeds, pumpkin seeds, linseeds and salt in a bowl. Add 3/8 litres of water and oil. Knead with the dough hooks of the hand mixer to a tough dough.
Rinse 2 baking trays with cold water. Cut the dough in half and spread each of them on a baking tray (37 x 32 cm) to form a plate about 3 mm thick. Score in pieces of about 6 x 10 cm. Bake one after the other in a preheated oven (electric cooker: 250 °C/ convection oven: 225 °C/ gas: level 5) for 4-5 minutes.
Switch the temperature down to (electric oven: 200 °C/ circulating air: 175 °C/ gas: stage 3) and bake for another 15-20 minutes. Remove from the baking tray immediately and allow to cool. Chive cream cheese tastes very good with it.
The crispbreads last at least 14 days when packed airtight in tins in a cool, dry place.