Preheat oven to 150 C / 300 F.

Line one baking sheet with baking paper and put another baking paper aside.

Mix all of the dry ingredients together in a large bowl.

Add egg whites, avocado oil and Parmesan until combined.

Transfer the mixture onto the prepared baking paper and place the other baking paper on top. Use your hands or a rolling pin to flatten the dough evenly spreading the mixture as thin as you can. (I like to flatten the dough in between the two baking papers on a tabletop and then transfer it onto the baking sheet)

Place in the oven with the baking paper on top still and bake for 40-45 minutes. HALFWAY THROUGH the baking time, remove the baking paper on top and continue baking. Pay close attention in the end to avoid any burning.

Turn off the oven and leave the crackers to dry in the oven.  Once cool, cut or break into pieces and serve. (You can also take them out of the oven right before the baking time is up and cut into bite size pieces with a pizza wheel and then put back into the oven to complete drying)