In a large bowl, whisk together the ground flaxseed and water. Set aside momentarily.
Meanwhile, preheat oven to 350 degrees. Line a 12-cup muffin tin with muffin cups.
Chop the walnuts and set them aside.
Next, mash the bananas. Add the bananas to the large bowl.
Add in the peanut butter, coconut sugar, canola oil, almond milk and vanilla extract. Whisk the mixture together well.
Add in the walnuts, oat flour, chia seeds, hemp hearts, baking powder, baking soda, cinnamon and fine sea salt. Stir together well, then mix in the chocolate chips.
Evenly spoon the muffin batter into the muffin cups.
Bake for 20-24 minutes, until they're lightly browned and pass the toothpick test.
Allow the muffins to slightly cool before transferring them to a cooling rack. Enjoy!