Separate the eggs, placing the yolks in one bowl and the whites in another.
Add the oat milk, egg yolks, banana, rolled oats, baking powder and vanilla extract to a blender. Blend until smooth.
Using a fork, whisk the egg whites until frothy and slightly airy.
Pour the pancake batter into a mixing bowl and gently fold in the whisked egg whites until just combined.
Lightly coat a non-stick frying pan with olive oil spray and place over a medium heat.
Spoon portions of batter into the pan to make small pancakes. Cook for 2–3 minutes on each side, or until golden brown and cooked through. Repeat with the remaining batter.
Divide the pancakes between two plates and top with full-fat Greek yoghurt, sliced banana, walnuts, flaked almonds and sunflower seeds. Serve immediately.