Preheat oven to 180C. Grease with cooking spray and line with baking paper, a 20cm x 10cm loaf pan.
Whisk coconut milk, sugar, eggs, cinnamon, salt and honey in a large bowl with an electric mixer until creamy and combined. Stir through the banana, oat and flour until thoroughly mixed.
Spoon batter in prepared pan. Sprinkle the top with raw sugar. Bake in pre-heated oven for 1 hour until well risen, golden on top and cooked through.
Serve warm or cold. Best toasted with butter. Freezes well.