Method
Preheat the oven to 180°C (350°F) with a rack in the centre. Line a 12-cup muffin tin with paper liners.
Mix the ground flaxseed and water and leave 5 minutes to thicken; this replaces the eggs.
Mash the bananas well in a large bowl, then stir in the flax mixture, soy milk, maple syrup and oil.
Add the oat flour, rolled oats, plant protein, baking powder and cinnamon and fold until just combined.
Divide the batter between the cups and sprinkle a few extra oats on top.
Bake for 20 to 22 minutes, until a toothpick in the centre comes out clean.
Cool in the tin for 10 minutes, then on a rack. Freeze extras for up to 3 months.
Storing and reheating
Keeps 4 days or 3 months frozen.