Preheat the oven to 175°C. Grease and line a medium size loaf tin.
Mash the bananas then add the eggs, oil and milk.
Mix the flour, oats, baking powder, ground almond and cinnamon together. Add the egg mixture and combine. Add more milk or flour to get a thick batter but not a dough.
Fold in the blueberries, then transfer the batter into the prepared tin.
Bake for 50 to 60 minutes in the middle of the oven, until the top is golden and an inserted skewer comes out clean.
Let it cool for 5 minutes in the tin, then transfer to a wire rack to cool completely.