Make "flax eggs" by adding the ground flaxseeds and six tablespoons of cold water to a bowl, mix well, then place that mixture in the fridge for ten minutes to thicken.
Preheat the oven to 350 degrees Fahrenheit.
Add the pumpkin purée, maple syrup, olive oil, flax eggs, vanilla, apple cider vinegar, cinnamon, ginger, nutmeg, cloves, salt, and unsweetened cocoa powder to a large mixing bowl, then mix well.
Add the coconut flour and baking soda, then mix to combine.
Spoon the batter into a parchment paper lined, 8 inch square baking dish. Use a spatula to smooth the batter into an even layer.
Bake at 350 degrees Fahrenheit for 50 minutes.
Let cool completely before serving.