In a high-speed blender or food processor add the oats and blend on med-high into a coarse flour. Add 1 cup walnuts, chocolate chips, cinnamon and salt and blend on med-high until everything is finely chopped (we don’t want big chocolate chip chunks).
Add the banana, maple syrup (depending on how ripe your banana is, you can do more or less maple syrup) and vanilla and pulse until a sticky dough forms.
Transfer to a bowl. Add remaining 1 cup walnuts to the blender and blend to roughly chop. Work the walnuts into the dough (use your hands!). Use a small scoop or roll into small balls.
Store in an airtight container in the fridge for up to 5 days or in the freezer for up to 3 months. If frozen, let it sit out for at least 10 minutes, but they’re BEST after 30 minutes or longer if you can wait!