In a bowl, mix the flour, cornstarch, almond flour, baking powder, salt, and cinnamon, and set aside.
In another bowl, mix the non dairy milk, oil, maple syrup, and sugar. Mix well until the sugar is dissolved.
Combine the wet with the dry, and mix to make a sticky, stiff doughy mixture. Transfer this to a parchment-lined baking sheet.
Wet your hands and using more water, shape the mixture into an oval, and press it down to even it out so that it is about 1/2-3/4 inches thick. Keep pressing, use a couple more drops of water for whenever it gets sticky again, and keep pressing and spread it out.
In a small bowl, mix the sugar and cinnamon for topping until well combined, and then sprinkle this all over the dough(which should still be a bit wet on the top). Press it down lightly with your hands if needed.
Bake at 350 degrees F(180 C) for 22-25 minutes. Check with a toothpick in the center.
Remove the baking sheet, and let it cool completely, then using a very sharp or serrated knife, slice the oval into 1/2 inch thick slices. Spread these slices over the parchment-lined baking sheet again, flattened on the wider side of the biscotti.
Bake at 275 degrees F (135 C) for 1 hour, or until the biscotti is crisp to your preference.
Cool completely and then store in an airtight container and keep on the counter for up to three weeks. You can also ice these with a simple icing of sugar and non-dairy milk.
If you want long slices like a coffee shop biscotti, slice the logs at an angle.
After the first bake, allow the biscotti loaf to cool, If you cut them when they are hot the slices will crumble.You can even bake the log a day in advance and then complete the slicing and second bake the next day.
After the second bake, make sure that the vegan biscotti cool on a wire rack to allow them to crisp completely.
You can also ice these with a simple icing of sugar and non-dairy milk. Or go "churros con chocolate" and drizzle them with melted dark chocolate.
Gluten free: Use a mix of 1 cup of oat flour 1/2 a cup of almond flour and 2 tablespoons of cornstarch or potato starch