Step 1

Preheat the oven to 400F/200C. Measure two pieces of parchment, or get a silicone mat and a similar-sized piece of parchment ready to fit a baking sheet/tray around 10x15in (25x38cm).

Step 2

Place the flour, salt and baking powder in a bowl and mix them together. Add the oats and seeds (pumpkin seeds, sesame seeds, flaxseeds) and mix so evenly distributed.

Step 3

Add the oil and water and combine until smooth. Take care not to overmix, you want it just combined. It should feel slightly stiff but still spreadable (add slightly more water if too stiff).

Step 4

Turn the mixture out onto the silicone mat or one piece of parchment and press the dough out to flatten a little. Top with the other piece of parchment and then roll out with a rolling pin to be around the same size as the piece of parchment. If it spreads beyond the area, you can trim a bit off and stick it to an area that has not spread as much. Then re-cover and roll over gently to help it join.

Step 5

Remove the top layer of parchment and carefully transfer the silicone mat/parchment to the baking sheet/tray. Score the top of the dough to make squares or rectangles of the size you want the crackers to be - I got around 24.

Step 6

Place the baking sheet/tray in the oven and bake for around 20 minutes until the top if dry and firm and the edges are just starting to become darker.

Step 7

Leave the crackers to cool a minute or two then cut along the score lines to break into crackers.