Preheat oven to 400 degrees and line a baking sheet with parchment paper - or grease well.
Add all the dry ingredients to a large mixing bowl and stir to combine.
Add all the wet ingredients to a blender and blend from low to high until the spinach is smooth and resembles a thin smoothie-like texture.
Pour the spinach mixture into the dry bowl and stir until a sticky ball of dough forms. Add in the grated vegan butter and optional vegan cheese shreds and start kneading everything together, in the bowl, using your hands. If your dough feels too sticky, add in a few tablespoons of additional flour. When the dough is fluffy yet dry enough to roll out, transfer it to a floured flat surface and roll out to about an inch thick - thicker for taller, thicker biscuits.
Cut out the biscuits using and cookie or biscuit cutter you'd like. transfer to the baking sheet. Repeat until all the dough has been used up.
Bake at 400 degrees for 18-20 minutes.
Serve warm! store leftover sealed in a container or plastic bag - in the fridge for up to two days. Beyond that time, freeze biscuits to save for later. Reheat in a toaster over, oven or microwave to serve.