Pre-heat oven to 220 degree C.
Mix together both the flours, salt and sugar.
Add the oil and water, and mix it all well together. There is no heavy kneading required. The dough will be slightly sticky and not-so-smooth.
Cut out a baking/parchment paper of the size of your baking tray. Divide the dough into two portions.
Sprinkle some flour on the paper and then roll out one portion of the dough in a rectangular shape. Roll it out as thinly as possible without tearing it.
Using a pizza cutter, cut it into long strips (approx. 1 inch by 2 inches.) or diagonally if you prefer.
Brush 0the dough very gently with a little water. Use a pastry brush if possible. Sprinkle half of the nigella, sesame and mixed seasoning. Using a fork, make tiny holes all over the crackers (this prevents them from puffing up in the oven.) Transfer the baking paper to your baking tray. Bake for 12-15 minutes and take out as soon as they turn slightly brown. They might be slightly soft but will become crisper as they cool. Repeat with second portion of the dough.
Store the crackers in an airtight container.