Preheat oven to 350 degrees F. In a large bowl, combine flaxseed and water (2 tbsp flaxseed + 5 tbsp water) and let sit for 5 minutes. Once it has created an “eggy” texture, mash in the bananas until well combined. Add in almond butter, coconut oil, vanilla, maple syrup, baking powder, baking soda, cinnamon, and salt. Stir well. Add in oats and flour and mix until well combined. Fold in mix-ins and stir until just combined.