Preheat oven to 350°F and coat an 8-inch square pan with coconut oil or line with parchment paper.
In a large mixing bowl, beat the pumpkin, maple syrup, egg and vanilla with electric beaters until well combined.
Add the baking soda, salt, cinnamon, ginger, and cardamom and beat again.
Finally add in the oat flour, rolled oats, almond flour, coconut flour, walnuts and cocoa nibs. Beat until just combined (don’t overmix).
Spoon dough into the pan and spread out until smooth and even. If dough is very sticky, wet a plastic spatula and use the back of it, use wet hands, or cover in another piece of parchment and pat it down.
Bake for 16-18 minutes or until lightly golden and firm to the touch. Remove from oven and let cool for at least 20 minutes before slicing (they will crumble if you cut when hot). Enjoy!