Preheat your oven to its lowest temperature setting.
Wash and peel your cassava.
Cut each of the cassava into two and remove the thread-like segment.
Cut your cassava into small pieces.
Line your baking sheet with parchment paper.
Put the cassava slices on your baking sheet, making sure they're not placed close to each other.
Put your baking sheet with the cassava slices inside your oven.
Allow to bake for 8 to 10 hours until they're dry and crumbly.
Once done, remove the baking sheet from the oven and place it on your countertop to allow it to cool.
Put your dehydrated cassava slices in your blender or food processor.
Pulse until you have a fine powder.
Place your colander over a bowl, then dump the fine powder you just made.
Sift to strain large pieces or clumps of flour.
Place your cassava flour in a glass container and seal it tightly.