Add in the gelatin, salt and coconut flour (and cinnamon if using) and pulse to combine.
Press the dough onto the greased cookie sheet very thinly.
Bake for 10 minutes. At this point it will look like a big flatbread. Let it cool a bit and either cut (using a pizza cutter) or tear it up into small cereal-like pieces.
Bake for 5-10 minutes more, stirring a couple times, until the flakes are golden and crisp. They will crisp up more as they cool as well. Watch closely so as not to burn the cereal.
As I could not find any Unsweetened Banana chips, I used Plantain chips instead and it turned out very well.