Preheat the oven to 350°F/180°C (160°C fan)
Grease the muffin tin with cooking spray or line with paper cases.
Toss the cranberries in flour and set aside. NOTE 1
In a large bowl, beat the oil and honey together with a whisk.
Add the eggs and beat well. Mix in the mashed bananas followed by the baking soda, vanilla extract, salt and cinnamon.
Add the flour and oats to the bowl and mix just until combined. DO NOT OVERMIX. NOTE 2
Using a spatula or spoon, gently fold in the cranberries
Divide the batter evenly between the muffin cups, filling each cup about two-thirds full. Sprinkle the tops of the muffins with oats and sugar
Bake muffins for 20 to 25 minutes, or until a toothpick inserted into a muffin comes out clean.
Leave muffins to cool in the pan for a few minutes before removing. If necessary,you can run a spatula or knife around the muffins to loosen it from the tin
These muffins keep well at room temperature for 2 days or up to 4 days in the fridge. You could also freeze the muffins for up to 3 months...just thaw out individual muffins as needed.