Preheat the oven to 170°C convection oven.
Line a rectangular baking tin (approx. 32cmx24cm) with baking paper.
Mix the pumpkin seeds, linseeds, sunflower seeds, sesame seeds, oat flakes, both flours, baking powder and salt in a bowl.
Add the oil and 125ml water and mix everything together with the dough hooks of the food processor or hand mixer until a relatively firm dough is formed. If the dough is too firm, add a little more water.
Roll out the dough evenly between two sheets of baking paper (approx.30cmx20cm).
Peel off the top sheet of baking paper. Place the dough on the lower baking paper in a rectangular baking tin (approx. 32cmx24cm). If necessary, press the dough to the edge with your fingers.
Divide the dough into 18 pieces with a knife.
Sprinkle the mixed kernels and seeds on the dough and press down well with your fingers.
Bake the crackers in the oven (centre) for approx. 35 min.
Remove the tray and leave the biscuits to cool briefly on it.
Then carefully divide at the previously marked points to make 18 pieces.
Leave the crackers to cool completely on a cooling rack.