Preheat your oven to 180°C / 350-375°F / Gas Mark 4-5.
Add oats to a large mixing bowl, followed by buttermilk, olive oil and egg. Stir to combine, then let soak for oats to absorb liquids for at least 10 to 15 minutes.
Use a small bowl and fork to mash the bananas. Set aside. Note 8
Combine ground cinnamon (topping) and brown sugar (topping) in a small bowl. Set aside.
Add flour, sugar, baking powder and salt to wet mixture, stir to combine.
Add cinnamon and mashed banana, stir to combine.
Portion muffin mixture across the muffin tin.
Sprinkle the top of each muffin with cinnamon sugar mix.
Oven Bake the muffins for 30 mins. Use a skewer inserted into the centre of one to test if they are done. If it comes out clean they are. If there is any wet batter, cook for a further 5 mins, then test again.
Use an oven mit to remove the muffin tray from the oven and set on wire cooling rack for 5 minutes. When muffins have slightly cooled, run a butter knife around the inside of the tin and gently pull the muffins out. Note 9
Serve hot with butter, drizzled honey and dusted icing sugar.