Preheat oven to 350 degrees F. Grease a muffin pan, or line cups with paper liners.
Weigh out almond and tapioca flours into a bowl. Add collagen, cinnamon, baking soda and salt. Whisk to blend. Set aside.
In bowl of food processor, add bananas, eggs, maple syrup, coconut oil and vanilla. Process until smooth.
Add flour mixture and blend again until smooth.
Stir in walnuts and chocolate chips.
Spoon batter evenly between muffin pan cups. Bake in preheated oven for 30-35 minutes, until tops spring back when touched. Remove from oven and allow to cool completely, then remove from pan.
Notes
I use my Vitamix Food Processor attachment to make these - you can use any food processor or even blender.I use an 8 cup muffin pan that makes slightly larger than "normal" muffins. You can also use a regular 12 cup muffin pan. If you wanted to make mini-muffins (24 cup pan) you would need to reduce the cooking time - maybe check them after 20 minutes. Likewise, if you wanted to make giant (6 cup) muffins, you would need to increase the cooking time.